Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d5ac4bf5f45ca80…

MALICIOUS

PDF

46.2 KB Created: 2020-08-11 20:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 974c266688657716aa463d6c2741408e SHA-1: 343f2f5b2ae7633bf36a1913c67f752bfe36c00d SHA-256: 0d5ac4bf5f45ca809a220a408d60fdfcb64b6c41c604c61f51f2e5ba61e08a06
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, indicating a phishing or malware distribution attempt. 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.cc/pify?keyword=atomic+number+and+atomic+mass+list+pdf
    • http://vovufe.hautepaws.com/uploads/1/3/0/8/130813095/30659.pdf
    • http://files.sunsetlakeorganics.com/uploads/1/3/0/7/130738943/lujoliw-gotewerajusexix-fatagotozi-pamolasobaj.pdf
    • http://files.westhawthornuniting.org/uploads/1/3/0/8/130813042/bumubikikivudan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/5048/4390/files/rational_choice_theory_summary.pdf
    • https://cdn.shopify.com/s/files/1/0435/8576/5533/files/sistem_budaya_indonesia.pdf
    • https://cdn.shopify.com/s/files/1/0431/1482/3844/files/gobunos.pdf
    • https://cdn.shopify.com/s/files/1/0436/4229/0336/files/86045872464.pdf
    • https://cdn.shopify.com/s/files/1/0430/7389/6602/files/57871121562.pdf
    • https://cdn.shopify.com/s/files/1/0433/8073/6151/files/kosimagewidadaxupebeve.pdf
    • https://cdn.shopify.com/s/files/1/0431/2953/6676/files/4845419586.pdf
    • https://cdn.shopify.com/s/files/1/0430/2641/5779/files/american_standard_heritage_12_heat_pump_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/8245/7000/files/94652315434.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006075.bin
70e4861794603fadef22cb27ea3eca9126b3919972805179264f139ef7ceae64
pdf-font-stream PDF embedded font (sfnt) at offset 0x6075 5432 bytes
font_01_sfnt_off000072cc.bin
0d63d752fcc0e38b0935142c7eee41093edbb3295b7e18f58f70b6621da14717
pdf-font-stream PDF embedded font (sfnt) at offset 0x72CC 10540 bytes
font_02_sfnt_off000096a0.bin
f04fb96856fa86c99babb5bf309615b780632e07d2318923ed038a7bfd4fd4ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x96A0 16204 bytes