Malicious PDF — malware analysis report

Static analysis result for SHA-256 747549e950048c95…

MALICIOUS

PDF

51.5 KB Created: 2020-10-27 14:25:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d4ce0641832819e3543fd5686b128b5d SHA-1: 3f140d923023b923a4b63ef53fdea5807641d44b SHA-256: 747549e950048c95f103d0a7ed9a0f1d65d2b22a363c96973f080e2082d4df98
194 Risk Score

Malware Insights

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

This PDF document contains a link to a known malicious redirector, disguised with a seemingly innocuous lure. The document body itself is heavily obfuscated but contains the malicious URL and a list of other URLs hosted on strikinglycdn.com and s3.amazonaws.com, likely part of a link farm to improve search engine ranking for malicious content. The ML classifier strongly indicated maliciousness.

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://ttraff.ru/123?keyword=teach+a+man+to+fish+bible+story In PDF document text
    • https://fobuxowomi.weebly.com/uploads/1/3/4/2/134235628/pakubujub-xoxazosisipo-nomafuroj-xukurobidibovej.pdfIn PDF document text
    • https://botubadixebom.weebly.com/uploads/1/3/1/4/131407995/vuses.pdfIn PDF document text
    • https://votusaponepo.weebly.com/uploads/1/3/4/4/134471583/denekizodikidaxa.pdfIn PDF document text
    • https://gukaguse.weebly.com/uploads/1/3/1/3/131398473/9749096.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ec8bc67-e68a-43d4-ab08-e9d9122a46d5/84348045217.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e99cf584-18a9-42b0-8a5e-be932638a597/36138262559.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26af72a6-f4ef-4772-b480-8139737cdb75/69696015500.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/115c4d94-f746-4b89-af39-6f3ec907a49e/cal_y_mayor_ingenieria_de_transito.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1febd1df-b5d8-49d2-9062-b49f27143070/71988012076.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/conducting_choral_music_garretson.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/simple_conical_projection_with_two_standard_parallel.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/up_budget_2019_in_english.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/9182/7105/files/korukuguxak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9074/6271/files/18253945437.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/3567/6831/files/introduction_to_law_uk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8810/2051/files/48006215724.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6773/6225/files/fb_lite_app_apk_latest_version.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4131/6264/files/19809632492.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1049/0022/files/migatemasoputuvasojipol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0215/0557/files/dark_souls_save_editor_remastered.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_off00008310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8310 5312 bytes
SHA-256: cd3e746dc1c5a0e5dcf9c96dd756fabaa86befd34fcff14e3283d5ffd174cdc3
font_01_sfnt_off00009501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9501 13392 bytes
SHA-256: 7915c59a94e333eef80f1dec2c23ad767cb50f5b7fde42dc19b772c1a852048f