Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0bb3bc743edc4f9…

MALICIOUS

PDF

44.0 KB Created: 2020-08-09 18:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c5169fd1affaec63e9358ebc0ddbfbf SHA-1: 7210a8a0397f51440676673722dc197afc8eb92b SHA-256: a0bb3bc743edc4f93dc33ba86f90d366ef7b5cf48178d4c7a3ca0a023f288c82
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a large number of embedded links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to manipulate search engine results. The primary attack pattern involves redirecting users to potentially harmful content.

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.ru/pify?keyword=enfermedades+por+malos+habitos+alimenticios+pdf
    • http://files.galaydegames.com/uploads/1/3/1/8/131871814/palojav_zixolekofol.pdf
    • http://files.hearsesigns.com/uploads/1/3/0/8/130814052/7204841.pdf
    • http://files.gingerandpicklesnutrition.co.uk/uploads/1/3/0/8/130813301/gujekafuputuvumobup.pdf
    • http://panoje.danielrossallmusic.co.uk/uploads/1/3/0/7/130738748/5308821.pdf
    • https://cdn.shopify.com/s/files/1/0433/8787/9580/files/69653439611.pdf
    • https://cdn.shopify.com/s/files/1/0427/9664/6556/files/49527709069.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0945/files/21942578081.pdf
    • https://cdn.shopify.com/s/files/1/0428/2531/8563/files/bekotifuxewabewa.pdf
    • https://cdn.shopify.com/s/files/1/0434/1789/5068/files/triangle_classification.pdf
    • https://cdn.shopify.com/s/files/1/0445/5052/0996/files/pygmalion_bernard_shaw_francais.pdf
    • https://cdn.shopify.com/s/files/1/0431/1082/6146/files/nawuvepumijeza.pdf
    • https://cdn.shopify.com/s/files/1/0432/6126/4035/files/handbook_of_catholic_apologetics.pdf
    • https://cdn.shopify.com/s/files/1/0429/4233/3084/files/24330016002.pdf
    • https://cdn.shopify.com/s/files/1/0433/5727/4270/files/sewojovavag.pdf
    • https://cdn.shopify.com/s/files/1/0434/1442/1653/files/alcohol_withdrawal_protocol.pdf
    • https://cdn.shopify.com/s/files/1/0440/3511/3110/files/capacitores_ejercicios.pdf
    • https://cdn.shopify.com/s/files/1/0432/8659/3694/files/who_geoff_smart.pdf
    • https://cdn.shopify.com/s/files/1/0436/9671/7977/files/mesipopetasovasufisage.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/
    • https://cdn.shopify.com/s/files/1/0428/2531/8563/files/bekotifu

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a5b.bin
ea76669749f2417b04785071d7808e835e8b114792c2d72d82752304fccefe1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A5B 5492 bytes
font_01_sfnt_off00007cd5.bin
0f13b5784c6b004c0ad60099c001f294bd6da9b142a58b3e0ff8b0767c3f4bb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CD5 10868 bytes

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