Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a871989f44a1ed7…

MALICIOUS

PDF

44.8 KB Created: 2020-08-12 02:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a0b87653bda644c93f1de824ab59af0 SHA-1: 38b662963fc194c55d3343521e4bcedeef35bc65 SHA-256: 7a871989f44a1ed770e9093a42921d425f89d753bfc14bdd9b1f06a3b2c11965
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links, many of which point to Shopify domains, but one critical link redirects to 'ttraff.cc', known malicious infrastructure. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same suspicious URL, suggesting an attempt to disguise a malicious redirector as a PDF download.

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=leaf+anatomy+of+c3+and+c4+plants+pdf
    • http://lugeduba.jamieathomas.com/uploads/1/3/1/4/131407995/zirinud.pdf
    • http://files.chaseburgrodandgun.com/uploads/1/3/0/8/130874025/ce5582.pdf
    • http://files.delloewenthalphotography.com/uploads/1/3/2/6/132696483/datadelomemur_pimavebef.pdf
    • http://tejinoge.bonezsoft.com/uploads/1/3/1/3/131383657/9240020.pdf
    • http://files.caritasquilts.com/uploads/1/3/1/4/131437873/mirosuzaju.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/3067/4597/files/gipagujunitup.pdf
    • https://cdn.shopify.com/s/files/1/0448/1312/3744/files/british_english_grammar_book_by_ashok_kumar_singh.pdf
    • https://cdn.shopify.com/s/files/1/0431/8104/7965/files/35152836078.pdf
    • https://cdn.shopify.com/s/files/1/0434/5652/8544/files/gudadunir.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tebagomi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8843/7655/files/nolimeza.pdf
    • https://cdn.shopify.com/s/files/1/0430/8549/6469/files/tozomefop.pdf
    • https://cdn.shopify.com/s/files/1/0440/5841/1160/files/alginac_injetavel_bula.pdf
    • https://cdn.shopify.com/s/files/1/0435/8370/1151/files/64307243323.pdf
    • https://cdn.shopify.com/s/files/1/0439/0728/5147/files/sejarah_agama_kristen_protestan_di_indonesia.pdf
    • https://cdn.shopify.com/s/files/1/0429/9436/8663/files/vowigatomofagume.pdf
    • https://cdn.shopify.com/s/files/1/0434/1940/2397/files/sepokogum.pdf
    • https://cdn.shopify.com/s/files/1/0431/9258/2293/files/calendario_lunar_menstrual_2020.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_off00006fd3.bin
90c3f2c8cabab8fbbe417d153da78c9dfaed8087dd8be5f4da7a4017b007b016		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FD3 5500 bytes
font_01_sfnt_off00008290.bin
7513a5005b826b4cc8518804cdaec7fbe77151ad2399e2bc7e971df3c6011b66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8290 10376 bytes

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