Malicious PDF — malware analysis report

Static analysis result for SHA-256 31125b0a70cbc9df…

MALICIOUS

PDF

56.5 KB Created: 2020-08-17 14:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1784bb35870b7f2672eb2ad98cd608b4 SHA-1: e614ee2998453f5c18245f30360e3bd55571e360 SHA-256: 31125b0a70cbc9df4a464275a96980ac5c59449d56c0cfdb6c1ab348afd9aa5d
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to a known malicious redirector (ttraff.ru). The document body, though heavily obfuscated, contains references to the Michelin Guide and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly indicates maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm designed for SEO manipulation, likely to obscure the true 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.ru/pify?keyword=michelin+guide+sf+2019+bib+gourmand
    • http://files.fexasas.com/uploads/1/3/1/4/131453144/376af3b7.pdf
    • http://files.nbhsffa.com/uploads/1/3/0/8/130815664/b350a7.pdf
    • http://nojikese.primroselane.com/uploads/1/3/0/8/130813765/wofavorujorunomapav.pdf
    • https://cdn.shopify.com/s/files/1/0430/0305/2191/files/vaperigaxevavo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3041/2437/files/juzujifuwofitobiwisu.pdf
    • https://cdn.shopify.com/s/files/1/0437/0015/8629/files/6590178988.pdf
    • https://cdn.shopify.com/s/files/1/0430/9758/7861/files/ashes_of_love_ost.pdf
    • https://cdn.shopify.com/s/files/1/0433/8624/1187/files/5589414050.pdf
    • https://cdn.shopify.com/s/files/1/0429/9977/5381/files/genubebagobemova.pdf
    • https://cdn.shopify.com/s/files/1/0437/8673/1671/files/dizififixiduz.pdf
    • https://cdn.shopify.com/s/files/1/0438/8634/6408/files/mefunejefazoguwa.pdf
    • https://cdn.shopify.com/s/files/1/0429/8525/9159/files/relunafasibokomolifevuliw.pdf
    • https://cdn.shopify.com/s/files/1/0432/5939/6254/files/36530483174.pdf
    • https://cdn.shopify.com/s/files/1/0430/6495/0946/files/90564991187.pdf
    • https://cdn.shopify.com/s/files/1/0430/4902/5690/files/17137591657.pdf
    • https://cdn.shopify.com/s/files/1/0431/4457/7185/files/ios_6_music_app.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_off00009c30.bin
4543d3b776f979aa8fb2fe68cf14c9913826913a00ae65aa4b501885d822dfde
pdf-font-stream PDF embedded font (sfnt) at offset 0x9C30 6060 bytes
font_01_sfnt_off0000b0a0.bin
c0c8c6484011a57bec4e1b59218f26667101b3f4bf627a04c3e72466275428ea
pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A0 10600 bytes