Malicious PDF — malware analysis report

Static analysis result for SHA-256 0afa3404b6aa98ef…

MALICIOUS

PDF

79.9 KB Created: 2020-08-03 23:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa3fa64f63db450da5b6154327c014a6 SHA-1: cc5146b67fb4bacdec04fd9192ad6868e674051a SHA-256: 0afa3404b6aa98eff7dc1b0194a9429c1d30082459cc568b741ef86ea948edc2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links, including one pointing to a known malicious redirector at `https://ttraff.ru/pify?keyword=bibliography+latex+pdflatex`. The document body, though heavily obfuscated, contains text fragments that suggest a lure related to academic or technical content. The presence of many external PDF links indicates a link farm, likely used to obscure the true malicious destination or to improve search engine ranking for malicious content. The ML classifier strongly flagged this PDF as malicious.

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=bibliography+latex+pdflatex
    • http://files.remotesensinglab.org/uploads/1/3/1/4/131437778/7211003.pdf
    • http://files.klacapital.com/uploads/1/3/1/4/131406173/d75f598.pdf
    • http://rolisul.dupagechiefs.org/uploads/1/3/0/8/130814238/penikogebiwotaraworu.pdf
    • http://files.purejoymissions.org/uploads/1/3/0/8/130814676/3645e46c8284d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/9343/3246/files/maximum_number_of_overlapping_intervals.pdf
    • https://cdn.shopify.com/s/files/1/0429/5042/6780/files/rupewewebejibugaxuzegiluw.pdf
    • https://cdn.shopify.com/s/files/1/0433/6176/3480/files/salirineze.pdf
    • https://cdn.shopify.com/s/files/1/0434/0921/1557/files/65229761183.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/regopubogamodapisakemix.pdf
    • https://cdn.shopify.com/s/files/1/0431/2521/1296/files/49831352841.pdf
    • https://cdn.shopify.com/s/files/1/0432/0781/9422/files/notetutus.pdf
    • https://cdn.shopify.com/s/files/1/0438/4302/7106/files/45617395590.pdf
    • https://cdn.shopify.com/s/files/1/0436/9776/6553/files/64691957072.pdf
    • https://cdn.shopify.com/s/files/1/0431/5404/7137/files/podevujafurojamituremuta.pdf
    • https://cdn.shopify.com/s/files/1/0437/8152/1565/files/47437997235.pdf
    • https://cdn.shopify.com/s/files/1/0427/8665/2316/files/jasukezegadumugeloxofazo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3672/8726/files/zudelelowasepenujidivu.pdf
    • https://cdn.shopify.com/s/files/1/0428/2092/7655/files/pikewupajufekem.pdf
    • https://cdn.shopify.com/s/files/1/0433/5045/8520/files/todakuzibomisexenen.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed02.bin
adeb1f8738271c3d2c58a69bf3d00f4f4526e82ec0b0a888c7f20ab2be79d900		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED02 5484 bytes
font_01_sfnt_off0000ffb2.bin
9fd18c84f364bee03f87126bd69367a409ea60c9a7ebda41cbcfbcdccef141c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB2 15968 bytes

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