Malicious PDF — malware analysis report

Static analysis result for SHA-256 7973f021e61c5114…

MALICIOUS

PDF

46.6 KB Created: 2020-08-20 08:33:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e60fc5d719afbbfa53a00d81ea4172a SHA-1: 532cdeebc94d75fe47fd08831fff42415b50ef71 SHA-256: 7973f021e61c5114e255a51a44e163b704fcc0afba44e43b767f317ade1a2fac
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, with one critical heuristic identifying it as a malicious redirector pointing to 'https://ttraff.cc/pify?keyword=kitchenaid+artisan+coffee+machine+manual'. Another heuristic flagged it as a link farm, indicating a large number of external PDF links, many hosted on Shopify. The ML classifier strongly supports the malicious verdict. The document body, though heavily obfuscated, also contains the malicious redirector URL and several Shopify links.

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/pify?keyword=kitchenaid+artisan+coffee+machine+manual
    • http://files.brycedancecompany.com/uploads/1/3/0/8/130813730/fb40b.pdf
    • http://files.manningartclass.com/uploads/1/3/1/8/131856134/fuviweg.pdf
    • http://files.soulsistersparanormal.com/uploads/1/3/0/9/130969204/1711769.pdf
    • http://rotake.knowbiblefactsfromfiction.com/uploads/1/3/2/7/132712207/nadorejaribugo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/7162/6659/files/17569245999.pdf
    • https://cdn.shopify.com/s/files/1/0431/1479/1068/files/bokuvekugivijateva.pdf
    • https://cdn.shopify.com/s/files/1/0428/9619/5737/files/psychology_experiment.pdf
    • https://cdn.shopify.com/s/files/1/0434/7723/7917/files/terrorismo_historia.pdf
    • https://cdn.shopify.com/s/files/1/0434/4135/6967/files/dictionnaire_anglais_franais_larousse.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sovonuvebapade.pdf
    • https://cdn.shopify.com/s/files/1/0438/4922/0256/files/chemistry_book_class_9.pdf
    • https://cdn.shopify.com/s/files/1/0427/5752/1574/files/87876879130.pdf
    • https://cdn.shopify.com/s/files/1/0438/5190/7237/files/brother_hl-_2140_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/5435/1015/files/introduction_to_ant_colony_optimization.pdf
    • https://cdn.shopify.com/s/files/1/0437/0504/1051/files/bernette_334ds_instruction_manual.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/fivovonej.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_off00006a8d.bin
37e53820bb382ad8fce7110abc9baa18bb29d742e90c6fda1c5c5ee3e65517d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A8D 5112 bytes
font_01_sfnt_off00007bb1.bin
93e364cbfebcccfbf10106657b17f0afd97171625753b583e3eccd9fbf9a90eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BB1 10472 bytes
font_02_sfnt_off00009f37.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F37 4324 bytes

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