Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f7a7b19fcf8eead…

MALICIOUS

PDF

53.9 KB Created: 2020-08-28 21:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8fe58ce9799cccb76d583ca25c95e472 SHA-1: a1613b56334b0a4d8d6e478504418eac43ff36c8 SHA-256: 5f7a7b19fcf8eead620ac016608e75cfa78be825bb7f97160816295be1e90a40
194 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many pointing to seemingly benign Shopify URLs, but also includes a critical link to a known malicious redirector at 'https://ttraff.cc/wix?keyword=fundamentals+of+thermodynamics+7th+e'. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs users to open a password-protected archive, a common tactic to evade gateway scanning. The presence of embedded URLs and the overall structure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=fundamentals+of+thermodynamics+7th+e
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7046/3895/files/79334754764.pdf
    • https://cdn.shopify.com/s/files/1/0463/1828/9053/files/handbook_stoeltings_anesthesia_coexisting_disease.pdf
    • https://cdn.shopify.com/s/files/1/0430/4502/7993/files/jijizagesipojixigaratera.pdf
    • https://cdn.shopify.com/s/files/1/0429/6785/9359/files/35394083495.pdf
    • https://cdn.shopify.com/s/files/1/0433/6897/2444/files/87381542437.pdf
    • https://cdn.shopify.com/s/files/1/0430/7710/7865/files/bhagavad_gita_as_it_is_english.pdf
    • https://cdn.shopify.com/s/files/1/0435/5827/3183/files/cag_auditing_standards_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/0128/2711/files/fupisanixopuvuros.pdf
    • https://cdn.shopify.com/s/files/1/0438/5849/3600/files/tribe_archipelago_summit_presets_free.pdf
    • https://static.usrfiles.com/ugd/b8c837_7ecd29a50d8c4831847747d0c6715636.pdf
    • https://static.usrfiles.com/ugd/b8c837_d67b4c963fb44659a47360a24d2ee498.pdf
    • https://static.usrfiles.com/ugd/b8c837_0e81fd44c89242d781c1bddc7448a2a8.pdf
    • https://static.usrfiles.com/ugd/b8c837_a6513caed15544eba0daf023de20d427.pdf
    • https://static.usrfiles.com/ugd/b8c837_8d49e5c5caf9482085299ed73482cb7e.pdf
    • https://static.usrfiles.com/ugd/b8c837_434ccc9b8f9e4b3ba382b2214af7b011.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000a4f1.bin
d2eae70379aec56f7a5c234cba033bfd11232718a5aecbfa7844bc5028f8e162		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA4F1 21064 bytes
font_00_sfnt_off00006f49.bin
1298755c7c7eab9e372ba13ed2546f3fd3fd66cbae65bf1b1dfb883a43322ff3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F49 5396 bytes
font_01_sfnt_off00008189.bin
2e73e860c7385e180d9b3c4bbb359cec7a51b98837b205807108fff9a556eb53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8189 10356 bytes

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