Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bfd2e7e0c0b94b5…

MALICIOUS

PDF

42.3 KB Created: 2020-08-05 09:39:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9d57e3a1cd81edf6db2888c3766d1e0 SHA-1: 8db5ca41397b68e361024d96cc8c7b9bd431c56e SHA-256: 5bfd2e7e0c0b94b5f0ddec77ebc00c3989bcc8319b5cdacc10f4bc82e865132b
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, indicating a link farm or SEO spamming operation. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a malicious intent to lead users to harmful content. The ML classifier also strongly flagged this PDF as malicious.

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=disadvantages+of+systematic+sampling+pdf
    • http://files.inthelaughterlocker.com/uploads/1/3/2/6/132695714/fd8e1a7d90.pdf
    • http://files.kendrathomastravaille.com/uploads/1/3/0/8/130813781/vowebolulixemuzug.pdf
    • http://xajerakij.aznstra.com/uploads/1/3/1/3/131379362/984ea55297c160.pdf
    • http://files.seryklee.com/uploads/1/3/2/8/132815008/rodowadivarajodub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/76102764406.pdf
    • https://cdn.shopify.com/s/files/1/0435/5565/1743/files/gesewesafagozaliwubojos.pdf
    • https://cdn.shopify.com/s/files/1/0429/7228/3033/files/github_deploy_keys.pdf
    • https://cdn.shopify.com/s/files/1/0432/8184/2332/files/niwomulibudumatu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0859/7927/files/sezari.pdf
    • https://cdn.shopify.com/s/files/1/0429/5114/7676/files/94626925656.pdf
    • https://cdn.shopify.com/s/files/1/0432/9019/8180/files/diwusoziguneri.pdf
    • https://cdn.shopify.com/s/files/1/0432/9262/3001/files/safuwovirosabegofurufe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pamuzinesikajojefex.pdf
    • https://cdn.shopify.com/s/files/1/0433/9014/0583/files/56269075777.pdf
    • https://cdn.shopify.com/s/files/1/0431/3038/8642/files/87953022547.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006763.bin
de0bbdda82b4cf80a2e48ec0afd48f610e4c160d340263d5a30e2255f283654d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6763 5540 bytes
font_01_sfnt_off00007a4f.bin
729b041eb105acfbf277131f46dd61028416dfe52c6bbca2426f244ba7762d80
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A4F 9980 bytes