Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d7343269f642a80…

MALICIOUS

PDF

37.9 KB Created: 2020-10-27 12:09:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 52711f8d0bfb9bf17fd3d577a1fcf1ec SHA-1: 25ef0fa56af3f60c3755bd5a62e6b51279278166 SHA-256: 3d7343269f642a80e528cd41593cdd9e60e4d583540f672fb96cc209774f1e81
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.cc, which is designed to funnel users to further malicious content. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files, many hosted on S3 buckets. This suggests an attempt to distribute content or phish users through a chain of redirects and linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.cc/123?keyword=the+simple+man%2527s+guide+to+real+estate In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380403/normal_5f8f4cd7cd589.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366364/normal_5f96eba61f681.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/pazifetanegapu/9769606694.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/xotiwane.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/sukoduvaxa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5365/3409/files/ziwomuvuleme.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9371/1265/files/tcash_wallet_apk_latest.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/8808/8728/files/533498486.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7990/2383/files/14360964043.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5724/5077/files/85086547097.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8586/6167/files/aditya_hrudayam_lyrics_in_tamil_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a8bdd78-afb6-4507-b84e-b5462cee9a00/31328853124.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4433c6f-3d35-4416-80d0-8a81a336e6eb/54776653816.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a936c59c-a5c7-4419-b89d-a1b6aa51e308/xexabenusasusudomuderifok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a0fc133-548c-4377-8dce-b01251964c17/44037707113.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49f921d1-7470-4927-9716-b4c3d326915a/kantr_1.3_indir_gezginler.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_off00005509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5509 5356 bytes
SHA-256: 886fdc0df374ef000bf6abd7cfee0c2121473e2b4b185b6978eed5238883975c
font_01_sfnt_off0000671c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x671C 10556 bytes
SHA-256: d920209384ac119bd1a72fd505bbfc92c7e7cb666118d7bcf1a0bbaa5bec5e30

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