Malicious PDF — malware analysis report

Static analysis result for SHA-256 4351e0ce9d4f3028…

MALICIOUS

PDF

49.4 KB Created: 2020-07-23 21:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31af62d60c43be7ee1c48b4063b711d7 SHA-1: 0deab55c26b59b9b2b3df38384511e7e7913ac26 SHA-256: 4351e0ce9d4f30289c6555c2d3dab704b602cca4fad9247a1861c1e6199612d5
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, and PDF_SEO_LINK_FARM indicates a large number of external links, likely for SEO manipulation or to host further malicious content. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to 'ruby programming language pdf', suggesting a lure.

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=learn+ruby+programming+language+pdf
    • http://files.teamhmac.com/uploads/1/3/2/3/132303320/5939541.pdf
    • http://files.cloudvalleycashmere.com/uploads/1/3/1/4/131453213/fenidakegezasax.pdf
    • http://files.treehousehashomes.com/uploads/1/3/0/7/130739780/38f88c6b4b.pdf
    • http://files.fhsroarstore.com/uploads/1/3/0/8/130874613/eaf281.pdf
    • https://cdn.shopify.com/s/files/1/0433/3407/4523/files/xijaxakaliwafebaw.pdf
    • https://cdn.shopify.com/s/files/1/0429/4646/1852/files/tejun.pdf
    • https://cdn.shopify.com/s/files/1/0430/9755/5108/files/12825950896.pdf
    • https://cdn.shopify.com/s/files/1/0429/2047/6828/files/gapaxedibarosomikuvidir.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/5989/files/2027042685.pdf
    • https://cdn.shopify.com/s/files/1/0433/5514/4347/files/kegipawalodexosizixo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1724/8672/files/xoregasukokavoloxubobufit.pdf
    • https://cdn.shopify.com/s/files/1/0429/2060/7900/files/29556257880.pdf
    • https://cdn.shopify.com/s/files/1/0433/4141/4552/files/derarok.pdf
    • https://cdn.shopify.com/s/files/1/0432/8715/0752/files/renokerubojetemiwi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1347/1384/files/15834788230.pdf
    • https://cdn.shopify.com/s/files/1/0434/6786/6265/files/75579848271.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/1/0429/2047/6828/files/gapaxedibarosomikuvidir.pd

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000082b4.bin
7e6e3de2750fb198b1ca10c738dc1613d5eab6cf633e3661fdbe7f7e730f2c43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82B4 5168 bytes
font_01_sfnt_off0000942a.bin
b09680d4a4e776c466e4d973e5bfd178947acde37c07299aced3cc972a8dee45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x942A 10548 bytes

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