Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d1539127fa46c74…

MALICIOUS

PDF

40.2 KB Created: 2020-08-31 02:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 981f176986b1b19b799a966b5893f3d2 SHA-1: 53ae77033faaba08b7aec9dfbe0bea255b7b7b0b SHA-256: 7d1539127fa46c74f81f964abf1ae7cc8a86d90d16563a60640a99d6b4c58f8b
154 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/wix?keyword=marriage+certificate+form+gujarati+pdf'. The document body, though heavily obfuscated, contains text related to a marriage certificate form, likely a lure to encourage clicks. The presence of numerous external PDF links, many of which are benign, suggests a link farm or SEO manipulation tactic to obscure the malicious redirect.

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/wix?keyword=marriage+certificate+form+gujarati+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8544/7833/files/teachers_day_speech_in_assamese_language.pdf
    • https://cdn.shopify.com/s/files/1/0427/6856/4380/files/zinosez.pdf
    • https://cdn.shopify.com/s/files/1/0430/8333/3786/files/lewalibavinesitires.pdf
    • https://cdn.shopify.com/s/files/1/0437/2371/8805/files/attacking_midfielder_role.pdf
    • https://static.usrfiles.com/ugd/913720_e019babd21ed4c16aba0001a39f3fb9e.pdf
    • https://static.usrfiles.com/ugd/9ea91e_f4b995b136214068a40f88e92ee8b35c.pdf
    • https://static.usrfiles.com/ugd/5de1df_f11580e1a15849aeb2c89ad3571b367e.pdf
    • https://static.usrfiles.com/ugd/756799_c239c6d883f243ad953bbc02af68fa05.pdf
    • https://cdn.shopify.com/s/files/1/0435/5407/8883/files/business_case_studies_books.pdf
    • https://cdn.shopify.com/s/files/1/0433/3525/4171/files/70071225340.pdf
    • https://cdn.shopify.com/s/files/1/0446/6468/4697/files/nz_shooter_manifesto_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/5603/5990/files/gangsta_s_paradise_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0431/0509/1745/files/97368462105.pdf
    • https://cdn.shopify.com/s/files/1/0437/7303/4658/files/ximewekum.pdf
    • https://cdn.shopify.com/s/files/1/0431/7573/9553/files/88864318669.pdf
    • https://cdn.shopify.com/s/files/1/0437/7241/2055/files/63153650090.pdf
    • https://cdn.shopify.com/s/files/1/0432/8348/0736/files/57528018745.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f1b.bin
0dc1ae3133057cd7ae0f3eda9be9297a3a8a273d62551fdc6a84f1ccbbc29358		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F1B 5344 bytes
font_01_sfnt_off0000713d.bin
7e5a65f1fabc15371e9b9966e5ce1fe18d1b5ba789f5d0efbe46d87a785ebba3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x713D 10060 bytes

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