Malicious PDF — malware analysis report

Static analysis result for SHA-256 74827b11c65c0d2b…

MALICIOUS

PDF

37.5 KB Created: 2020-08-10 00:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe273e63db64989cdd5f6f91e2a5959d SHA-1: 23ed52302b3517c47dd71322e20bf46418ad9ae1 SHA-256: 74827b11c65c0d2b8de197d1fa23561847eb59ae63bbb5f22945d086952f0a15
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final destination of the malicious payload. The document also contains a large number of links to other PDFs hosted on Shopify, suggesting a link farm or a method to distribute further malicious content. The ML classifier strongly indicated maliciousness, supporting the heuristic findings.

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=beckett+baseball+april+2020+pdf
    • http://files.workscapeartisans.com/uploads/1/3/2/6/132680986/1281410.pdf
    • http://wiwalawis.seakapparel.com/uploads/1/3/0/8/130814328/acc4b64102f.pdf
    • http://wojel.sheawhite.net/uploads/1/3/1/3/131379578/tunekina_ronufezipuse_rapuz.pdf
    • http://files.westlakehsdance.com/uploads/1/3/2/7/132710694/tupategigaxasibujuw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8875/6374/files/rebizuwudalobatolefebid.pdf
    • https://cdn.shopify.com/s/files/1/0437/7165/8389/files/cambios_psicologicos_en_la_adultez_intermedia.pdf
    • https://cdn.shopify.com/s/files/1/0434/2589/0469/files/70256438609.pdf
    • https://cdn.shopify.com/s/files/1/0429/6271/4773/files/kabepiwosugewasok.pdf
    • https://cdn.shopify.com/s/files/1/0435/2658/6520/files/diablo_3_crusader_leveling_build.pdf
    • https://cdn.shopify.com/s/files/1/0434/1760/0156/files/bupigikadesire.pdf
    • https://cdn.shopify.com/s/files/1/0431/2177/0656/files/andres_oppenheimer_libro_basta_de_historias.pdf
    • https://cdn.shopify.com/s/files/1/0434/6016/5797/files/mifevudigefufaxesobobixa.pdf
    • https://cdn.shopify.com/s/files/1/0433/7713/1683/files/tenancy_agreement_sample_malaysia.pdf
    • https://cdn.shopify.com/s/files/1/0431/5797/9304/files/47181848522.pdf
    • https://cdn.shopify.com/s/files/1/0428/2118/9788/files/78909103833.pdf
    • https://cdn.shopify.com/s/files/1/0428/5179/5107/files/9039736813.pdf
    • https://cdn.shopify.com/s/files/1/0440/8557/5832/files/august_2020_current_affairs_testbook.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_off0000524a.bin
c921a54cef017299c83eb1c0cd1b79de2e3db1b28ba0b713b3a7ae419fef7512		 pdf-font-stream PDF embedded font (sfnt) at offset 0x524A 5676 bytes
font_01_sfnt_off000065a6.bin
763c8046c10763ec514b1db7e1bc2fb85605bf7bb9fae639f5e3b4c5746de982		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65A6 10440 bytes

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