Malicious PDF — malware analysis report

Static analysis result for SHA-256 486e2834551bac53…

MALICIOUS

PDF

60.5 KB Created: 2020-10-27 04:31:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 7d368f3de119595f9d9151eb32a4b86c SHA-1: e53b156d61bb096c28d82d3dd80f8a6a29cb42b2 SHA-256: 486e2834551bac53764cc7787d03867df856b952ce9cfb21572b8ab9bdbeac4e
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a redirector URL that is associated with malicious activity, specifically a lure for downloading software. The document body, though heavily obfuscated, contains text related to 'Spotify premium apk 2018 download' and the malicious URL, indicating a phishing or malware distribution attempt. The presence of a link farm heuristic further suggests this PDF is part of a larger SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gettraff.ru/123?keyword=spotify+premium+apk+2018+download In PDF document text
    • https://buserakufazuwus.weebly.com/uploads/1/3/4/0/134097478/4849339.pdfIn PDF document text
    • https://nipaxibovaj.weebly.com/uploads/1/3/1/3/131379211/6d7c7.pdfIn PDF document text
    • https://sabijodamibig.weebly.com/uploads/1/3/0/7/130775907/2657289.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371523/normal_5f923a63c42a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385415/normal_5f8c9d1779ca5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366947/normal_5f878efe525fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368218/normal_5f8dc09c4f6ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374540/normal_5f8ef3bbb89bb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xesigeze/robad.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/action_verb_word_search.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/93332508404.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4492/8674/files/canonical_form_of_boolean_algebra.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0744/2584/files/jugefelelimolesimogude.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/0116/2146/files/99762499620.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/balanitis_candidisica_recidivante.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/925887770.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/xafefujukokemubiwedor.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/konezujigizekufusu.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/ethical_considerations_in_research_proposal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5a92c3c-1298-434a-a83f-bd7e14d5e2d6/christmas_lights_lexington_sc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8518f235-c896-462c-8fda-3440844733f0/ill_be_home_for_christmas_sheet_mus.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9239 5892 bytes
SHA-256: a6250496faed9d93899ea0df5a0a7659b587dc20457cb059cdc4793a1c1a5b6a
font_01_sfnt_off0000a64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA64C 12456 bytes
SHA-256: 69a42e2071ddfa81a48e052500e421e3af45d291613f9364014195012184cf72
font_02_sfnt_off0000ce3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3C 16312 bytes
SHA-256: aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0