Malicious PDF — malware analysis report

Static analysis result for SHA-256 a906258974e1c977…

MALICIOUS

PDF

49.9 KB Created: 2020-08-17 01:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c99ffd51bc2813607ced5daf36460097 SHA-1: f208195a54401f98fc5fb87cfd3c5d2fd7d1a259 SHA-256: a906258974e1c977f869745348236e0dfe10143aaea2403b7c26f70adba4d8fe
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of the primary links, 'https://ttraff.cc/pify?keyword=seeing+is+believing+polar+express+sheet+music', is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body text, though partially corrupted, contains the same lure text as the malicious redirector URL.

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=seeing+is+believing+polar+express+sheet+music
    • http://files.erinumc.com/uploads/1/3/1/3/131398246/gafaxixa-bakopemotox-nuluxe-tijisasekepivob.pdf
    • http://files.joellesolomon.com/uploads/1/3/1/6/131606502/zevumudef.pdf
    • http://files.mitsuhiro-ikeda.com/uploads/1/3/0/9/130969761/f88e9e1ff5af.pdf
    • http://files.spjayaraj.com/uploads/1/3/1/8/131860787/vimaluwapi_litatoga_kudameriw_ralaza.pdf
    • http://files.missouriinstituteofhypnotherapy.com/uploads/1/3/2/6/132695543/8275253.pdf
    • https://cdn.shopify.com/s/files/1/0432/1217/7563/files/estilos_de_aprendizaje_visual_auditivo_kinestesico.pdf
    • https://cdn.shopify.com/s/files/1/0433/3830/1590/files/xefiviworetanaresepago.pdf
    • https://cdn.shopify.com/s/files/1/0431/7803/3303/files/76355260946.pdf
    • https://cdn.shopify.com/s/files/1/0437/8863/2213/files/all_details_about_gst.pdf
    • https://cdn.shopify.com/s/files/1/0447/0882/3193/files/ascaris_suum_morfologia.pdf
    • https://cdn.shopify.com/s/files/1/0431/7180/7394/files/coolio_fantastic_voyage.pdf
    • https://cdn.shopify.com/s/files/1/0429/5576/7967/files/bsc_physics_syllabus_utkal_university.pdf
    • https://cdn.shopify.com/s/files/1/0440/0414/7350/files/paraphrasing_exercises_ielts.pdf
    • https://cdn.shopify.com/s/files/1/0438/4922/0256/files/chhaya_prakashani_physics_books_for_class_12_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57355052908.pdf
    • https://cdn.shopify.com/s/files/1/0430/6200/1821/files/8953537872.pdf
    • https://cdn.shopify.com/s/files/1/0434/1733/8005/files/el_bodeguero_letra.pdf
    • https://cdn.shopify.com/s/files/1/0433/7496/8986/files/demededalodesatux.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006053.bin
f3c5dce37c164b220ed9a35373999defe7510d5aeeb3c41e08340cc816b9213a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6053 5720 bytes
font_01_sfnt_off0000739e.bin
aaed1322f6fa1f2bc5794c59dca882dc72fbe5dfe840cd2eb6a64f2c545d4cfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x739E 15776 bytes
font_02_sfnt_off0000a48c.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA48C 16204 bytes

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