Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b6d2ff9aab1e75c…

MALICIOUS

PDF

33.5 KB Created: 2020-08-29 12:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a10d1986550feefcf371d094aeee8c7e SHA-1: bc7bb2053a3196187acb3ac528b715b3372872ad SHA-256: 5b6d2ff9aab1e75c1139e8d16965ff1e2be3ed1784895821dd81b518e6801a42
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external links, suggesting a link farm. One of the embedded URLs, 'https://ttraff.ru/wix?keyword=evidence+sync+version', is identified as a known malicious redirector. While no scripts were explicitly extracted, the PDF structure and the presence of embedded URLs indicate an attempt to lure the user to malicious infrastructure, likely as part of a phishing campaign.

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=evidence+sync+version
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/2351/6323/files/castrol_engine_oil_price_list_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/4752/6305/files/ve_a_keyboard.pdf
    • https://cdn.shopify.com/s/files/1/0429/7211/9199/files/lepumoxoxifexoforunudun.pdf
    • https://cdn.shopify.com/s/files/1/0433/9430/2117/files/69049899394.pdf
    • https://cdn.shopify.com/s/files/1/0469/9196/6360/files/mutelamerezodob.pdf
    • https://static.usrfiles.com/ugd/b8c837_4b5dd9cdd6584393835540a1e9ad4517.pdf
    • https://static.usrfiles.com/ugd/b8c837_b9dd1f4941204249bc8796e2d77bc6a5.pdf
    • https://static.usrfiles.com/ugd/b8c837_ef2b933a735040d496d20ab50877c2cd.pdf
    • https://cdn.shopify.com/s/files/1/0463/6318/1217/files/aradois_bula_anvisa.pdf
    • https://cdn.shopify.com/s/files/1/0439/8468/3166/files/xitapati.pdf
    • https://cdn.shopify.com/s/files/1/0454/7280/9126/files/8941527327.pdf
    • https://cdn.shopify.com/s/files/1/0431/6109/2247/files/chromium_windows_10_64_bit.pdf
    • https://cdn.shopify.com/s/files/1/0435/8776/4387/files/solidworks_free_2018.pdf
    • https://cdn.shopify.com/s/files/1/0431/6843/2288/files/27290338355.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_off000046d0.bin
1b32d36027ef12171f729a1c2d1efe671046ffb00cabaf29b86a572bb7c2a865
pdf-font-stream PDF embedded font (sfnt) at offset 0x46D0 4812 bytes
font_01_sfnt_off00005741.bin
e2cb71455d91f31f30f5ad12d6ad3c6744bb3448345dcd5fe77e7f65933e88de
pdf-font-stream PDF embedded font (sfnt) at offset 0x5741 9992 bytes