Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d32910b4ce8cc57…

MALICIOUS

PDF

41.4 KB Created: 2020-08-25 06:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f9dd433a31731d432b3e3386c58262f SHA-1: 462c08b018ed01fc53e1ad8ae114b712a532e452 SHA-256: 6d32910b4ce8cc57483addf04555883e97306dc28fff5e4113c592a6e8c91135
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 hosting other PDFs, and one critical link to a known malicious redirector. This suggests a link farm or SEO poisoning attack designed to drive traffic to malicious infrastructure. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the embedded links are the primary indicators of malicious intent.

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=best+android+apps+2018+may
    • http://sukuroj.darkstarfinancial.net/uploads/1/3/1/6/131606339/xujiwotenalilu.pdf
    • http://files.adorablepotatocreations.com/uploads/1/3/1/4/131406527/9165d29d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5712/7336/files/4643845611.pdf
    • https://cdn.shopify.com/s/files/1/0435/9749/6483/files/17894557640.pdf
    • https://cdn.shopify.com/s/files/1/0437/8220/9698/files/addictive_keys_vst_crack.pdf
    • https://cdn.shopify.com/s/files/1/0439/1917/9931/files/pepigojuvagodobu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1760/0165/files/zibapabizewubitisirog.pdf
    • https://cdn.shopify.com/s/files/1/0433/8316/0983/files/agathiyam_book_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0431/2940/5600/files/5712360084.pdf
    • https://cdn.shopify.com/s/files/1/0428/3770/4867/files/mogirofedodinari.pdf
    • https://cdn.shopify.com/s/files/1/0430/9726/0192/files/brennan_manning_books.pdf
    • https://cdn.shopify.com/s/files/1/0435/1941/0335/files/trigonometry_in_astronomy.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_off000063f0.bin
7f133de4d7356cdbadfd0f20da4e46be9926c3e13c41c21dd141c9df55e6f98c
pdf-font-stream PDF embedded font (sfnt) at offset 0x63F0 5744 bytes
font_01_sfnt_off00007769.bin
ca0fb34f132b4f4ce7959c5b91a47ff0b6c40c9b9a960380f1e6c26ae7d49f6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7769 9904 bytes