Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ee94f42418abf5b…

MALICIOUS

PDF

46.9 KB Created: 2020-08-14 04:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25c90b41bbbc4ba3ec84b0669815765c SHA-1: 72b2a7d8a1ed71d4a79a4f1db3436c955af88ea7 SHA-256: 5ee94f42418abf5beef5f795255e447a49f3878a2de499688dcb5a4b43732ae6
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to a 'study guide' and the malicious URL, suggesting a lure. The presence of many external PDF links, some pointing to benign Shopify URLs and others to unknown domains, indicates a link farm designed to obscure the malicious destination. The ML classifier also 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=developmental+psychology+clep+study+guide
    • http://files.numeracyteacher.com/uploads/1/3/0/7/130775747/sowategerefisaz_kizige_viravul_narukel.pdf
    • http://files.mcmoms.org/uploads/1/3/2/8/132814302/guxirexopuvi_kivami_tepexefut.pdf
    • http://wubaxi.csautoelite.com/uploads/1/3/1/4/131437423/261c8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/2795/4854/files/army_regulation_25_50.pdf
    • https://cdn.shopify.com/s/files/1/0434/8346/3832/files/rubabobuwekifirevi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9800/4899/files/visual_basic_2010_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0437/8918/9272/files/76035146608.pdf
    • https://cdn.shopify.com/s/files/1/0433/2063/9646/files/gofimuwovo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6128/8868/files/58266178006.pdf
    • https://cdn.shopify.com/s/files/1/0439/4627/9080/files/ninufilomekojifawuduvap.pdf
    • https://cdn.shopify.com/s/files/1/0428/5064/8223/files/45535870522.pdf
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/12320207765.pdf
    • https://cdn.shopify.com/s/files/1/0433/4750/9416/files/bojibujujiwu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006aaa.bin
d486b8fd1ed9f2d025138e78a24066967c630e7a0e9b9446fe97ddc0e6f65498		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AAA 5436 bytes
font_01_sfnt_off00007d05.bin
9a33627779b898350c32387e3d276b195e160c2f64c3b09a56184f989ad66cf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D05 10444 bytes
font_02_sfnt_off0000a0c3.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0C3 4324 bytes

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