Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a27acef55c5dcd2…

MALICIOUS

PDF

51.2 KB Created: 2020-08-22 09:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94866ad49169c715e269e773b97d4a8f SHA-1: ad633a3621407ea657a8d3900beb14bd0f1f3535 SHA-256: 0a27acef55c5dcd2ddbfffedd4fe26f151be2c8c85cb215d419d6c14451ec6f4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to URLs that are part of a link farm, suggesting an attempt to lure users to malicious sites. The ML classifier also strongly indicated maliciousness.

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=amicalement+votre+musique
    • http://files.novushwc.com/uploads/1/3/0/8/130814124/jenajadasiwumu.pdf
    • http://files.nicolemarshallphotography.com/uploads/1/3/1/4/131454114/b7a25.pdf
    • http://files.arkansasbearcreekgoldensanddoodles.com/uploads/1/3/1/3/131381612/finawusime.pdf
    • http://files.sfachapterfootball.com/uploads/1/3/1/3/131380612/e1ab9d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/1437/4054/files/82086362657.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13908697451.pdf
    • https://cdn.shopify.com/s/files/1/0433/6710/4664/files/common_action_verbs.pdf
    • https://cdn.shopify.com/s/files/1/0436/4202/8190/files/lewejitipodifular.pdf
    • https://cdn.shopify.com/s/files/1/0436/1060/3677/files/zetebiguwabonorajadu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2597/2904/files/58249848562.pdf
    • https://cdn.shopify.com/s/files/1/0435/5715/9063/files/ae_templates_free_videohive.pdf
    • https://cdn.shopify.com/s/files/1/0432/3042/9346/files/sazaxe.pdf
    • https://cdn.shopify.com/s/files/1/0431/6174/7605/files/52522645951.pdf
    • https://cdn.shopify.com/s/files/1/0437/6382/6840/files/rubalipa.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_off000086e9.bin
bb6eeb9cb3254a4728a939ed8b72061f7e4edf26ccdbd1c168a76c82bb87a7d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x86E9 5120 bytes
font_01_sfnt_off00009837.bin
121a0da13e5950bb11eacc37257e4720bdecf43122be3e12a14e420ee5788ad5
pdf-font-stream PDF embedded font (sfnt) at offset 0x9837 12296 bytes