Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c7beae099411e4f…

MALICIOUS

PDF

37.5 KB Created: 2020-08-12 01:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1597fb15f28c614fc70040e76bc483e4 SHA-1: bab13e63f2172341322bd02d13bf908d078f52d4 SHA-256: 5c7beae099411e4f022aacf74697b540c425debf28d4c362ab2cf44042ea902c
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, including Shopify. One prominent link, 'https://ttraff.cc/pify?keyword=nick+loehr+s+bijective+combinatorics+pdf', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. This suggests the document is part of a link farm or SEO poisoning scheme designed to redirect users to malicious sites.

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/pify?keyword=nick+loehr+s+bijective+combinatorics+pdf
    • http://levar.andreacontee.com/uploads/1/3/2/8/132814930/3168354.pdf
    • http://kezazitiz.kimandcandice.com/uploads/1/3/1/4/131482992/kebujivumelawerotof.pdf
    • http://files.itfcwomen.co.uk/uploads/1/3/1/4/131437775/nasuvoj-vudexevavoj-fazatixikizufa-xosakaxizo.pdf
    • http://files.chelsealanephotography.com/uploads/1/3/1/4/131455398/f878be.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/2379/4337/files/business_environment_text_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/1409/5001/files/48646785938.pdf
    • https://cdn.shopify.com/s/files/1/0431/0047/1456/files/nepuwumubafi.pdf
    • https://cdn.shopify.com/s/files/1/0428/4488/1059/files/87371206759.pdf
    • https://cdn.shopify.com/s/files/1/0431/6453/2900/files/niraguxadaguwatuk.pdf
    • https://cdn.shopify.com/s/files/1/0437/3492/5463/files/27466599174.pdf
    • https://cdn.shopify.com/s/files/1/0431/9831/6705/files/26546531558.pdf
    • https://cdn.shopify.com/s/files/1/0436/3078/8758/files/79934476453.pdf
    • https://cdn.shopify.com/s/files/1/0430/3349/3658/files/463298507.pdf
    • https://cdn.shopify.com/s/files/1/0438/3503/1712/files/gypsum_board_ceiling.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5092/files/ziwukesuwugojeme.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_off00005472.bin
60de4ca7495af9fd76cab7a50ec50691c0277cdf1b34f83e8259a5473bc4015c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5472 5704 bytes
font_01_sfnt_off000067af.bin
7acc823147848555ad2636578ca6f659454746eea9cc7086a743b5cb26c14170
pdf-font-stream PDF embedded font (sfnt) at offset 0x67AF 9832 bytes