Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2ece8b64d8506e1…

MALICIOUS

PDF

41.6 KB Created: 2020-08-24 19:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc0b50347782df4c67f24ecaae267a12 SHA-1: 9dfb7c364b34aea07bcb96c34e5576bb1c532258 SHA-256: a2ece8b64d8506e1b5ec2f3091017ca67b16761f644261827fc2db0a2417bb6f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure, specifically 'ttraff.com'. The document also contains a high density of external links, many hosted on Shopify, which is characteristic of SEO link farms used to manipulate search engine rankings or distribute malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack pattern appears to be the redirection of users to potentially harmful sites.

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=borland+c+builder+pdf
    • http://dovog.ssaohiostate.com/uploads/1/3/0/8/130874359/nafaba_tisumi_kokasaguris_poxilitofugi.pdf
    • http://files.cfhsperformingarts.com/uploads/1/3/1/4/131453267/xerame-gagepogiradopi.pdf
    • http://files.womeninedresearch.com/uploads/1/3/1/4/131437775/luzedoxixojifutef.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/fghb2868tf_spec_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/7149/4554/files/bobenawabogufisik.pdf
    • https://cdn.shopify.com/s/files/1/0447/1151/0170/files/saxavumomovafeketopegevo.pdf
    • https://cdn.shopify.com/s/files/1/0438/5744/5029/files/97575701938.pdf
    • https://cdn.shopify.com/s/files/1/0431/4464/2715/files/buoyant_force_formula.pdf
    • https://cdn.shopify.com/s/files/1/0429/6530/3455/files/easy_adirondack_chair_plans.pdf
    • https://cdn.shopify.com/s/files/1/0432/9521/1680/files/64647209976.pdf
    • https://cdn.shopify.com/s/files/1/0434/8903/4402/files/oxford_picture_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0428/9318/1095/files/61278362107.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000657c.bin
0cc02b930d8317ba162454e3c0f87cb4462de644df529b0db544981a7d93bbc3
pdf-font-stream PDF embedded font (sfnt) at offset 0x657C 5160 bytes
font_01_sfnt_off0000770e.bin
5a2f3bad08dc46648c38e9996d45093ebf49e4ca87e615f74f06b0d15eb3f192
pdf-font-stream PDF embedded font (sfnt) at offset 0x770E 10068 bytes