Malicious PDF — malware analysis report

Static analysis result for SHA-256 153aa16067c95c1f…

MALICIOUS

PDF

72.8 KB Created: 2020-08-31 07:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37db41adac693babf827982c4cde76f2 SHA-1: 5b25d9a913127365b7a5cd9228582e51575960d7 SHA-256: 153aa16067c95c1ff345d8881a1429505cdbd343ce21d8cae2276b93e504c888
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.ru/wix?keyword=variable+power+supply+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to contain this URL and a list of other PDF links, suggesting a link farm or redirection tactic. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=variable+power+supply+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/868401_11ef6f2e872548aab9a39a6b7f6c6553.pdf
    • https://static.usrfiles.com/ugd/b8c837_132b69ffa7884215a1e977c4c89356e1.pdf
    • https://static.usrfiles.com/ugd/1813b3_dc9c3f09e6c044a49765cc3c6dfc4ccf.pdf
    • https://static.usrfiles.com/ugd/e73fea_c14d32a4280a490ebcf81a590714ce68.pdf
    • https://cdn.shopify.com/s/files/1/0431/4506/8699/files/sonic_3_a.i.r.pdf
    • https://cdn.shopify.com/s/files/1/0452/8714/5634/files/pogaf.pdf
    • https://cdn.shopify.com/s/files/1/0439/7082/2302/files/3d_reader_app.pdf
    • https://cdn.shopify.com/s/files/1/0465/3626/1782/files/50768138312.pdf
    • https://cdn.shopify.com/s/files/1/0431/1659/3312/files/nipuzifijujaso.pdf
    • https://cdn.shopify.com/s/files/1/0432/2859/4344/files/rijazani.pdf
    • https://cdn.shopify.com/s/files/1/0437/3023/9637/files/ropopumipakalupisom.pdf
    • https://cdn.shopify.com/s/files/1/0437/4124/9690/files/80649422002.pdf
    • https://cdn.shopify.com/s/files/1/0435/9480/9512/files/23883082689.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdc3.bin
91ee62a470966007bcbc0813408499a9fb665a5a605b0ee1f5986d190ef647a2
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC3 5028 bytes
font_01_sfnt_off0000def7.bin
40f10280f4a067a52ca343dc2234570acf669c863ee87725051876edaeb218b6
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF7 13128 bytes
font_02_sfnt_off00010880.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x10880 4324 bytes