Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ff31f0b763ad9e…

MALICIOUS

PDF

39.7 KB Created: 2020-08-15 11:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fad8489c96d9651e89935d377f2e1cf SHA-1: 14ec18537e335d5149dac86ac175dbe51a6a0418 SHA-256: 18ff31f0b763ad9edd894da5ddc57457f14c82845685735fc7014bb38266c5b2
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 pointing to Shopify domains, but one critical link redirects to a known malicious domain, ttraff.com. This suggests a link farm or SEO poisoning tactic to lure victims to malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of embedded URLs and the redirector link indicate a phishing or redirection attempt.

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/wb?keyword=importance%20of%20time%20value%20of%20money%20in%20financial%20management%20pdf
    • http://files.nowasteballarat.org.au/uploads/1/3/1/8/131858661/1897879.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7210/2301/files/cancer_de_pancreas_sintomas.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xekugoxozeritazol.pdf
    • https://cdn.shopify.com/s/files/1/0431/6348/4315/files/posajabivanomurazit.pdf
    • https://cdn.shopify.com/s/files/1/0429/6232/1571/files/zonipoletik.pdf
    • https://cdn.shopify.com/s/files/1/0430/9408/1687/files/26100496142.pdf
    • https://cdn.shopify.com/s/files/1/0437/3289/3857/files/zanabiruxirarip.pdf
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/39471639381.pdf
    • https://cdn.shopify.com/s/files/1/0434/1481/4885/files/bass_arpeggios_tab.pdf
    • https://cdn.shopify.com/s/files/1/0436/1859/9075/files/curriculum_vitae_format_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/0964/5478/files/19540402958.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_off00005c59.bin
6e147e08bdefeccca2953af78d5878cb767df803fc67827d8d64423fee0c4365
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C59 5396 bytes
font_01_sfnt_off00006e9f.bin
b812464c6461e83f48e42978580b595342ba2875fc0596630d197d29c1c6e0cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E9F 10212 bytes