Malicious PDF — malware analysis report

Static analysis result for SHA-256 87efbe231eeebfba…

MALICIOUS

PDF

49.1 KB Created: 2020-08-07 03:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1157c2066e42c478c17aab81ee46568f SHA-1: cc63f6e1a407183c489403dc7da2bb1418c83771 SHA-256: 87efbe231eeebfba09a6eb466a74caf2b20a38db7e46f651d1239e5fa5fdfbf5
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, disguised as a Dell r730 spec sheet. The document also features a large number of external PDF links, many hosted on Shopify, likely for SEO manipulation to improve search engine ranking for malicious content. The ML classifier 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.com/pify?keyword=dell+r730+spec+sheet+pdf
    • http://files.classicalprep.com/uploads/1/3/0/7/130740138/0e97f60509ff.pdf
    • http://files.mukipictures.com/uploads/1/3/1/1/131163658/vumulimatetu_mefexivisekuw.pdf
    • http://files.thefashionanalyst.com/uploads/1/3/1/3/131383624/wezunawe.pdf
    • https://cdn.shopify.com/s/files/1/0429/8938/7939/files/17483159331.pdf
    • https://cdn.shopify.com/s/files/1/0432/6594/9862/files/sidewujuvituzabi.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/worememiwapa.pdf
    • https://cdn.shopify.com/s/files/1/0429/9957/8773/files/2713841787.pdf
    • https://cdn.shopify.com/s/files/1/0429/1647/9132/files/jinuweduwifiwumonapuja.pdf
    • https://cdn.shopify.com/s/files/1/0427/6341/9814/files/17598506551.pdf
    • https://cdn.shopify.com/s/files/1/0432/8371/0117/files/nowofola.pdf
    • https://cdn.shopify.com/s/files/1/0429/2257/3990/files/xexebezosima.pdf
    • https://cdn.shopify.com/s/files/1/0431/7783/6702/files/sirope.pdf
    • https://cdn.shopify.com/s/files/1/0437/7142/9015/files/makalah_metabolisme_protein.pdf
    • https://cdn.shopify.com/s/files/1/0429/2745/6419/files/physics_laboratory_experiments_7th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/5765/9547/files/mekarodogefivurefusagaxox.pdf
    • https://cdn.shopify.com/s/files/1/0439/0499/1400/files/bevalulawimenugikuvubur.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_off000081db.bin
9e3805da3b1f72e4ca50c6b070ccd77e5cf47ef7b459a3de646d06f31ccbddc8
pdf-font-stream PDF embedded font (sfnt) at offset 0x81DB 5416 bytes
font_01_sfnt_off00009455.bin
71bd5cee32e9267aab1142ef267c555943a8c6299af65620146a8a5c43196e2f
pdf-font-stream PDF embedded font (sfnt) at offset 0x9455 10360 bytes