Malicious PDF — malware analysis report

Static analysis result for SHA-256 61897d855a4324ac…

MALICIOUS

PDF

42.2 KB Created: 2020-08-16 18:36:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65eab1401206bf13901c09da23343a93 SHA-1: 5f00458bc27267b0003d62d9fd48834a982682d3 SHA-256: 61897d855a4324ac869aa67e92afeb875c52cb9db65044d81d24b5bafbcc91c9
154 Risk Score

Malware Insights

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

The PDF file contains numerous links, including one identified as a malicious redirector (https://ttraff.com/pify?keyword=gift+voucher+template+publisher). The document body, though heavily obfuscated, suggests a lure related to 'gift voucher template publisher'. The presence of many external PDF links, some benign and some unknown, indicates a potential link farm or distribution mechanism. The ML classifier strongly flagged this PDF as malicious.

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.com/pify?keyword=gift+voucher+template+publisher
    • http://files.concepcionslashes.com/uploads/1/3/1/1/131164568/2d18da.pdf
    • http://files.calcountyexecs.com/uploads/1/3/2/6/132681826/5fa9ff4c134f.pdf
    • http://files.alexlawkc.com/uploads/1/3/0/7/130739919/nafapuxusuwe.pdf
    • http://bubas.mtephraimbaptistchurch.org/uploads/1/3/0/7/130740072/guweguserevirisadala.pdf
    • http://pirelamik.keystonegraphic.com/uploads/1/3/0/7/130776407/bepotalokavekekolux.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/2795/4854/files/affairscloud_current_affairs_monthly.pdf
    • https://cdn.shopify.com/s/files/1/0430/8657/7828/files/40957256752.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bijalikupuxamimidesedol.pdf
    • https://cdn.shopify.com/s/files/1/0431/0079/9140/files/binomial_multiplication.pdf
    • https://cdn.shopify.com/s/files/1/0427/8226/1415/files/imdb_gone_girl_parents_guide.pdf
    • https://cdn.shopify.com/s/files/1/0427/5827/5238/files/gewokabiba.pdf
    • https://cdn.shopify.com/s/files/1/0431/7813/1611/files/54370202961.pdf
    • https://cdn.shopify.com/s/files/1/0445/3564/4319/files/research_paper_about_cosmetics.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_off00005728.bin
a2b6001119eef25e516b19f6cf707d29fdd4bb94d2870506d78421ecbec1a9c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5728 5260 bytes
font_01_sfnt_off00006914.bin
4c9eec5203a2fe1bf25703af1d77786ce06319ca496f45411c075f8a5111915a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6914 11332 bytes
font_02_sfnt_off00008de1.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DE1 4324 bytes

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