Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b6ef250d74c0c13…

MALICIOUS

PDF

46.7 KB Created: 2020-08-29 16:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 097432acf34b7fff4d502eb600bd60fa SHA-1: f077a70fc60f18c80d3d0585c885e7294f0d3549 SHA-256: 5b6ef250d74c0c1382bd59653290d8ba5bef19e4f556b90bb08464c6d95c7379
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/wix?keyword=combitek+f23e+manual'. Additionally, it exhibits characteristics of a PDF SEO link farm, containing numerous links to other PDFs, with the primary one being 'https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sigejorivuzogekos.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL.

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/wix?keyword=combitek+f23e+manual
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sigejorivuzogekos.pdf
    • https://cdn.shopify.com/s/files/1/0434/4214/3397/files/mibob.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6654/files/6789944451.pdf
    • https://static.usrfiles.com/ugd/b8c837_66def0301fec4b8982a9bcd60fb46537.pdf
    • https://static.usrfiles.com/ugd/b8c837_5c5396c97f42487d8270e4952f8b5ff2.pdf
    • https://static.usrfiles.com/ugd/b8c837_96711c4ee1d3412d9f57b6d255b93abe.pdf
    • https://static.usrfiles.com/ugd/b8c837_02dc9a9b57754c5db7d57ef4ae18daea.pdf
    • https://cdn.shopify.com/s/files/1/0431/3550/0439/files/74748861973.pdf
    • https://cdn.shopify.com/s/files/1/0434/6940/6360/files/jenupijuguxobe.pdf
    • https://cdn.shopify.com/s/files/1/0435/6443/3569/files/wawuzorewisonititowedu.pdf
    • https://cdn.shopify.com/s/files/1/0434/9578/4600/files/kuletigipizutivuv.pdf
    • https://cdn.shopify.com/s/files/1/0434/0459/1255/files/carmina_burana_piano_reduction.pdf
    • https://cdn.shopify.com/s/files/1/0433/6304/1430/files/ruxakevejuwagomi.pdf
    • https://cdn.shopify.com/s/files/1/0427/8353/9366/files/jamemutuginasawob.pdf
    • https://cdn.shopify.com/s/files/1/0432/9812/8036/files/dapofodokex.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006309.bin
4a09220963dd969320b9677ff9029bc48dc972111db408bf6b5a4e60f09164d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6309 5044 bytes
font_01_sfnt_off0000742b.bin
59efa0445081e469ce792ff362f9807a874a584cb10c02d542f2c6f1d60efc9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x742B 14332 bytes
font_02_sfnt_off0000a061.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA061 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.