Malicious PDF — malware analysis report

Static analysis result for SHA-256 6256a4a5ec4f3f4a…

MALICIOUS

PDF

45.9 KB Created: 2020-08-27 20:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef403b99910dfd6511c7c695429f8791 SHA-1: e103f23dda991f2d109f6c5af5d44388ed1cf53d SHA-256: 6256a4a5ec4f3f4a21ea106d1917d2e377a89377e07d8c55e66073519ec7513f
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=amperimetro+de+gancho+pdf', which is likely intended to lead the user to a malicious site. The presence of numerous other PDF links suggests a link farm or SEO poisoning attempt.

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.com/pify?keyword=amperimetro+de+gancho+pdf
    • http://files.kctaste.net/uploads/1/3/2/7/132740700/f94d59.pdf
    • http://files.abrushwithnature.studio/uploads/1/3/1/4/131406885/184799.pdf
    • http://sinomata.northwestpetroleum.com/uploads/1/3/0/7/130740514/wokimala.pdf
    • http://files.escondidofoundationarch.org/uploads/1/3/0/7/130775520/ziburisalewa-jilutawe-bidusida-pokipepif.pdf
    • http://jekovu.lwcmusic.org/uploads/1/3/0/8/130874276/nadafageluxase-vomemanetuniliv-zewivafur-ralipokesakames.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0451/1091/9321/files/alter_ego_a1_french.pdf
    • https://cdn.shopify.com/s/files/1/0433/6638/3768/files/student_exploration_calorimetry_lab_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0429/7683/7785/files/41847164348.pdf
    • https://cdn.shopify.com/s/files/1/0464/5129/4376/files/esmo_consensus_guidelines_colorectal_cancer.pdf
    • https://cdn.shopify.com/s/files/1/0435/3789/1487/files/gerogivelesavomu.pdf
    • https://cdn.shopify.com/s/files/1/0437/3708/8154/files/min_heap_insert.pdf
    • https://cdn.shopify.com/s/files/1/0431/0020/9319/files/jarexafiwarozorimofibaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6429/files/converter_bmp_to_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/4527/3248/files/calidad_estratgica_total_total_quality_management.pdf
    • https://cdn.shopify.com/s/files/1/0433/8712/5927/files/xezaruxefiw.pdf
    • https://cdn.shopify.com/s/files/1/0435/2580/0087/files/dobupemetasot.pdf
    • https://cdn.shopify.com/s/files/1/0432/4527/3251/files/17224283252.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_off00006470.bin
ab299463ae723b94329ec1f9fe9d5093d709cb339d7313050cdcc26edb355136		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6470 5136 bytes
font_01_sfnt_off000075ae.bin
e87df0b7d52229c726cda4087038a52f43fe06e24c48e3258ff9fa5ae5cee7d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75AE 11544 bytes
font_02_sfnt_off00009b13.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B13 4324 bytes

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