Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b928778ed12008d…

MALICIOUS

PDF

40.7 KB Created: 2020-11-02 17:01:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: bf77152830370b61f51c3b249c3d31c1 SHA-1: ccbf7d3cf585ec5cd3ca4650554e2234120fc561 SHA-256: 3b928778ed12008d13d2c54c4ce7d1f6d333c17af852418899cecf887a49d692
194 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains URLs that appear to be part of a link farm designed to lure users to potentially malicious content, such as fake movie downloads. The ML classifier strongly indicated maliciousness, and the presence of redirector links supports a phishing or scamming attack pattern.

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/wb?keyword=swtor%20trooper%20guild In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375886/normal_5f967a7773da3.pdfIn PDF document text
    • https://kuvofexe.weebly.com/uploads/1/3/1/1/131163751/6247835.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5503/3753/files/genius_full_movie_apk_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0506/9783/0554/files/mafarajemuxurakun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6112/4008/files/radical_feminism_a_documentary_reader.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00b06ef0-4104-4581-b02d-1ed7769114e7/piano_keyboard_letter_stickers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/6442/5146/files/math_worksheets_for_4th_graders_long_division.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a36e403-efc3-41c3-b010-37d9b12230dd/94519613793.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f87f36e1-a851-46cc-8c2f-16953ba53e35/11402539956.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/2349/7877/files/harpa_crist_cifra_simplificada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02b537e4-7d24-4aa9-a6a9-0a24a6c326ef/xinupikovikosovipisazix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3644cea7-601b-4feb-bf5c-af1ae67e91fc/bajenexujip.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FC6 4936 bytes
SHA-256: 6b0398de712abce436d9e6b84335cc9a5e3f40a815a56d7091fc5364748e0085
font_01_sfnt_off000070b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70B4 11104 bytes
SHA-256: 3396717768725e9647140b30c2db4515bf2b8f331f6320cbf32edc0182956ad4