Malicious PDF — malware analysis report

Static analysis result for SHA-256 1534642c93778645…

MALICIOUS

PDF

38.4 KB Created: 2020-08-20 07:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bbae8ba25c3e7023d4ac2906c6c4f81f SHA-1: a6aa8367deea32675fa219bd08de2d6a11f05ceb SHA-256: 1534642c93778645c1811402433884b9130328d4a3140fea64b8806306379849
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to Shopify domains hosting PDF files, but one critical link redirects to a known malicious domain. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure related to educational content. The ML classifier strongly indicates maliciousness, and the presence of a redirector link confirms a malicious intent to lead the user to a harmful site.

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=scatter+plot+worksheet+algebra+1+answers
    • http://xurumeb.texasphonerepairsupply.com/uploads/1/3/1/1/131164250/ribagifebuwurub.pdf
    • http://files.drcarolineclarke.com/uploads/1/3/1/8/131872021/fuxibizu.pdf
    • http://jazaxop.thepowissettgroup.com/uploads/1/3/1/3/131379685/gefuzokuminarukarof.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/5785/4102/files/81521447663.pdf
    • https://cdn.shopify.com/s/files/1/0428/8472/6943/files/86266592606.pdf
    • https://cdn.shopify.com/s/files/1/0437/5517/6097/files/1959743551.pdf
    • https://cdn.shopify.com/s/files/1/0429/8647/1587/files/65158831539.pdf
    • https://cdn.shopify.com/s/files/1/0434/7386/2821/files/canon_rebel_t3_manual.pdf
    • https://cdn.shopify.com/s/files/1/0427/3248/6823/files/83406444907.pdf
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/53744020586.pdf
    • https://cdn.shopify.com/s/files/1/0429/6556/5589/files/duserizusekibulerobajori.pdf
    • https://cdn.shopify.com/s/files/1/0449/2158/5831/files/english_capsule_download.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_off00005922.bin
55e6f36165954e9d8367a6e8e0b6e937aedafc1c3b20eb98e3deeb7416dcc6dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x5922 5648 bytes
font_01_sfnt_off00006c59.bin
9d445b0caa5322562e24c9e8ef716be5b95ee714c4b01d745f51c652715b7192
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C59 9524 bytes