Malicious PDF — malware analysis report

Static analysis result for SHA-256 e817d97c1b7a000f…

MALICIOUS

PDF

39.4 KB Created: 2020-08-10 03:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e413119fe5c7de760b76307b60a72a43 SHA-1: 5bcd48c0b1f0a985bccf1e31089c2eb89091214a SHA-256: e817d97c1b7a000fda3df35182fd896fac184cf4157771258e8d54bc387acab8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The primary malicious URL is https://ttraff.ru/pify?keyword=ocean+animals+word+search+pdf. The document body, though heavily obfuscated, contains this URL and other links to PDF files hosted on Shopify, likely as part of a SEO poisoning or link farm tactic to improve search engine ranking and distribute the malicious link. The ML classifier strongly supports the malicious nature of this PDF.

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.ru/pify?keyword=ocean+animals+word+search+pdf
    • http://files.thebyrdfeedermeals.com/uploads/1/3/0/9/130969026/8018287.pdf
    • http://files.oneilllab.com/uploads/1/3/1/4/131438459/zijufe.pdf
    • http://files.seagrasspottery.com/uploads/1/3/1/8/131860479/22ae729c5e.pdf
    • https://cdn.shopify.com/s/files/1/0428/1673/3340/files/lipufi.pdf
    • https://cdn.shopify.com/s/files/1/0433/2208/1448/files/74161722490.pdf
    • https://cdn.shopify.com/s/files/1/0437/6517/0334/files/asalem_jarigindante_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/0989/1742/files/84619420052.pdf
    • https://cdn.shopify.com/s/files/1/0428/0087/3631/files/gijivopu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7124/2389/files/sexinugologeromamod.pdf
    • https://cdn.shopify.com/s/files/1/0438/9237/5704/files/kanujowulov.pdf
    • https://cdn.shopify.com/s/files/1/0432/2492/4319/files/revox.pdf
    • https://cdn.shopify.com/s/files/1/0432/6916/1126/files/fudegigu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3680/3233/files/95433616386.pdf
    • https://cdn.shopify.com/s/files/1/0437/1460/9303/files/tavogaliwonaganofebuwe.pdf
    • https://cdn.shopify.com/s/files/1/0437/9849/5389/files/agility_ladder_drills_soccer.pdf
    • https://cdn.shopify.com/s/files/1/0427/7947/6134/files/sivoguke.pdf
    • https://cdn.shopify.com/s/files/1/0436/0772/0094/files/zewisemutanosumimamoxola.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • https://cdn.shopify.com/s/files/1/0427/7947/6134/files/sivoguke

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b54.bin
3eef561f867e981572c121c08469141f7455328f914497f1f24d0e0389a9c8ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B54 5512 bytes
font_01_sfnt_off00006df1.bin
b7e75d2725ecd53b24311e3ac89b11f386b9985423a40ec96224b3987f380a9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DF1 10088 bytes

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