Malicious PDF — malware analysis report

Static analysis result for SHA-256 b71fd9e11d34407d…

MALICIOUS

PDF

40.7 KB Created: 2020-08-23 07:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b487034897c373a9c3565cd6c97787b SHA-1: 64f3e0172cc2aac82414973fa71b397a7dbaab70 SHA-256: b71fd9e11d34407d7fb505a6b677ec2ffffb91d0995893a9923d5e85ba619610
152 Risk Score

Malware Insights

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

The PDF contains a link farm with 26 external links, including a redirector to 'ttraff.ru'. This indicates a phishing or malicious redirection attempt. The ML classifier strongly supports the malicious verdict. No scripts were extracted, limiting the analysis of specific behaviors.

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=web+design+tools
    • http://files.baroverbar.com/uploads/1/3/2/6/132682295/wedukeku.pdf
    • http://files.donovankleintv.com/uploads/1/3/1/4/131453054/9893319.pdf
    • http://files.jamesaaronhogan.com/uploads/1/3/1/6/131606262/wodimuvifos_zezuwamogipe_bezexew_xejawuwir.pdf
    • http://files.atwatervillagepsych.com/uploads/1/3/0/8/130874238/puwanadotojadojozi.pdf
    • http://xebebifag.hockeyaustralia.net/uploads/1/3/0/7/130775797/rivakipezatifesolu.pdf
    • https://cdn.shopify.com/s/files/1/0435/1701/8267/files/27798291890.pdf
    • https://cdn.shopify.com/s/files/1/0428/2816/9375/files/18623100289.pdf
    • https://cdn.shopify.com/s/files/1/0430/6717/9165/files/arthur_miller_playing_for_time.pdf
    • https://cdn.shopify.com/s/files/1/0431/9445/0078/files/59451649023.pdf
    • https://cdn.shopify.com/s/files/1/0431/2491/6388/files/xazafubuxikozikebota.pdf
    • https://cdn.shopify.com/s/files/1/0452/3789/5325/files/cover_letter_for_engineering_jobs_fresh_graduate.pdf
    • https://cdn.shopify.com/s/files/1/0437/9806/9410/files/xawavunoxiditela.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3288/files/philips_beard_trimmer_7000_manual.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_off0000636d.bin
03d7551e3dbb51a03f35445fd9afb967364b799930a028709e38eb532356e0fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x636D 4840 bytes
font_01_sfnt_off000073fe.bin
5608fd32c601a43629691e1a5deb61140ea053aad68ccb58bf330072e938e3a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x73FE 10036 bytes