Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a9173d4f8540ad…

MALICIOUS

PDF

33.5 KB Created: 2020-08-01 08:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13d192acb7a44ff4008289a540ced506 SHA-1: 7753bd1261f11220377e54be896ea5c9512b9d10 SHA-256: 71a9173d4f8540ad17266f0fa9e3ac70659a1a9404f87c088d6df571d0d06087
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious infrastructure, likely intended to lead the user to a phishing or malware download site. The document body, though heavily obfuscated, contains the URL and text suggesting a lure for "Physics lab manual answers". The presence of numerous external PDF links further indicates a link farm or redirection strategy.

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=physics+lab+manual+answers
    • http://files.ponnyresultat.se/uploads/1/3/1/4/131437792/lotebasitelukotevu.pdf
    • http://files.mycasitashoa.com/uploads/1/3/2/6/132682204/3325615.pdf
    • http://files.c3classes.com/uploads/1/3/0/7/130775242/2951292.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9373/7110/files/razosone.pdf
    • https://cdn.shopify.com/s/files/1/0427/8140/9436/files/65447647766.pdf
    • https://cdn.shopify.com/s/files/1/0428/6133/0591/files/wujokenazisufulobe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pigagijewunafusigiku.pdf
    • https://cdn.shopify.com/s/files/1/0433/9892/2392/files/43361611594.pdf
    • https://cdn.shopify.com/s/files/1/0433/1814/9285/files/nerawa.pdf
    • https://cdn.shopify.com/s/files/1/0430/8575/8628/files/mejetulikozisuzulipanowam.pdf
    • https://cdn.shopify.com/s/files/1/0433/6464/7077/files/sesubep.pdf
    • https://cdn.shopify.com/s/files/1/0427/5827/5238/files/gazamutigo.pdf
    • https://cdn.shopify.com/s/files/1/0439/1088/9624/files/gijirigotexukexejola.pdf
    • https://cdn.shopify.com/s/files/1/0429/0933/5715/files/85311044583.pdf
    • https://cdn.shopify.com/s/files/1/0431/8635/6375/files/48770612495.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_off000045fb.bin
0ebc1c5b0ec51803c816ef1be80a08429ae063bb74a33678ee0a892a58ce0456
pdf-font-stream PDF embedded font (sfnt) at offset 0x45FB 5376 bytes
font_01_sfnt_off0000582c.bin
4e242d020850447e5ebc210f69f04c862ea555c431b8153026831f3d48a05102
pdf-font-stream PDF embedded font (sfnt) at offset 0x582C 9720 bytes