Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d516b1ce72ff81f…

MALICIOUS

PDF

54.7 KB Created: 2020-08-18 18:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f620b71b6d2d1e079e09ebe17b6e13f SHA-1: db77f12a80b55c6750673ea3c8cb604869af84c9 SHA-256: 9d516b1ce72ff81f59efea86b6599bd34c0f713e7615e944867965ec416590c2
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, many pointing to Shopify domains, but one critical link redirects to `ttraff.ru`. This domain is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting a lure to trick users into clicking through to potentially malicious content.

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.ru/pify?keyword=hackintosh+guide+pdf
    • http://files.freecitysourcebook.com/uploads/1/3/1/4/131483830/7855096.pdf
    • http://files.unitedalapahabulldogs.com/uploads/1/3/1/6/131606343/luvutewoje_lasemabexezidi.pdf
    • http://jemutizuj.pq-review.com/uploads/1/3/2/3/132303168/8c49530.pdf
    • http://files.mrsbingham.com/uploads/1/3/1/4/131438563/zupigobuwitevawiw.pdf
    • https://cdn.shopify.com/s/files/1/0434/0780/2518/files/31482865646.pdf
    • https://cdn.shopify.com/s/files/1/0435/1636/2904/files/kilunisifar.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3098/files/12067887034.pdf
    • https://cdn.shopify.com/s/files/1/0434/4673/0904/files/nutrition_starbucks.pdf
    • https://cdn.shopify.com/s/files/1/0428/4334/0956/files/meneti.pdf
    • https://cdn.shopify.com/s/files/1/0439/9883/8942/files/27054514587.pdf
    • https://cdn.shopify.com/s/files/1/0440/3606/3397/files/tiniminifegewaji.pdf
    • https://cdn.shopify.com/s/files/1/0443/3071/3244/files/antipsychotic_medications_list.pdf
    • https://cdn.shopify.com/s/files/1/0434/7602/5497/files/96411876403.pdf
    • https://cdn.shopify.com/s/files/1/0443/0499/0364/files/autosar_layered_software_architecture.pdf
    • https://cdn.shopify.com/s/files/1/0436/9963/4328/files/vonukurujekiwokovew.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009937.bin
84bcf52a330ded403962d0bd47ec3aa8898e14d26787f0588b48ca1922bff37a
pdf-font-stream PDF embedded font (sfnt) at offset 0x9937 5312 bytes
font_01_sfnt_off0000ab3d.bin
36f99766cd8e8c09eb87d2cbc4e63ef195d2c419bdb83ff85daa9f58fa940787
pdf-font-stream PDF embedded font (sfnt) at offset 0xAB3D 10152 bytes