Malicious PDF — malware analysis report

Static analysis result for SHA-256 74aba2ab9382bc0e…

MALICIOUS

PDF

40.3 KB Created: 2020-09-14 01:39:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf2800481307b0319ff3695d0c2edda0 SHA-1: 473033a0a4bbb3987b6d1978a4059493f7d651d8 SHA-256: 74aba2ab9382bc0e0496e526d067777dd527f35fe849045d2a531009d86c09e5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to malicious content. The document body, though obfuscated, contains keywords related to a "Quadrajet manual choke conversion kit" and includes multiple URLs, suggesting a link farm or SEO poisoning tactic to attract victims. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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.club/wix?keyword=quadrajet+manual+choke+conversion+kit
    • http://files.spoontogether.com/uploads/1/3/0/7/130775977/gobuvolapa_bofemovesozigoz_tamakibulogiko_gikipek.pdf
    • http://files.scubalifeofpy.com/uploads/1/3/1/3/131383318/7a16eb25204f292.pdf
    • http://nigadimim.martinaobrien.com/uploads/1/3/1/3/131383761/letejeviw.pdf
    • http://files.dodsonmiddleschool.net/uploads/1/3/1/8/131856188/402e87cc2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/d6af85_99c357e356f94c088620578c3247c19e.pdf
    • https://static.usrfiles.com/ugd/9f69bd_73e9ba2ff2f047fb80e396a613d516d0.pdf
    • https://static.usrfiles.com/ugd/9fc8c3_b0f06f14e1b745989ed9cc1cba3ab070.pdf
    • https://static.usrfiles.com/ugd/87b9a8_9fecd68338d04bf0847622e8f58bdf78.pdf
    • https://cdn.shopify.com/s/files/1/0435/6984/0283/files/47135797924.pdf
    • https://cdn.shopify.com/s/files/1/0431/0306/0128/files/linux_ubuntu_budgie.pdf
    • https://cdn.shopify.com/s/files/1/0437/3735/0305/files/eclipse_java_32_bit_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0434/6658/8325/files/71448575972.pdf
    • https://cdn.shopify.com/s/files/1/0433/6631/8230/files/xedikofukajisimila.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_off00005096.bin
0f30558dfc5c150fc52ebfa47c4de194960f684b44692dbe0080d91ba1b401b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5096 5324 bytes
font_01_sfnt_off00006287.bin
ccb9f3db2131ad3ea075cb3e2c0cebfb6afb91d736d70b66e328600b1c2343c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6287 10504 bytes
font_02_sfnt_off0000868a.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x868A 4324 bytes

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