Malicious PDF — malware analysis report

Static analysis result for SHA-256 27b346ff41cefa1d…

MALICIOUS

PDF

38.0 KB Created: 2020-08-19 18:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 986365f45423da10843a18210ec9e294 SHA-1: ba9ad198e65a27826a603d7901b27c0d9d738f17 SHA-256: 27b346ff41cefa1d5eb928c04d7f8acca69d37099304e63634a217f0d8409b5b
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple critical heuristics for containing a malicious redirector link and a large farm of external PDF links. The ML classifier also strongly indicated maliciousness. The primary malicious URL identified is https://ttraff.ru/pify?keyword=anchor+bolt+cad+block, which is likely used to redirect users to a malicious site. The document body contains garbled text but also includes the same URLs found in the heuristics, reinforcing the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=anchor+bolt+cad+block
    • http://kasaxuju.zacharyjblum.com/uploads/1/3/1/0/131070450/sosufekowujepusutusa.pdf
    • http://nurafilol.pendulumalchemy.com/uploads/1/3/0/7/130775286/tuvoronizex-fofijanosi.pdf
    • http://files.sbelart.com/uploads/1/3/1/3/131379477/6586071.pdf
    • https://cdn.shopify.com/s/files/1/0437/0310/7752/files/watexipirukunoxa.pdf
    • https://cdn.shopify.com/s/files/1/0440/4147/0117/files/41._8877_87._6361.pdf
    • https://cdn.shopify.com/s/files/1/0430/9313/1425/files/85104300368.pdf
    • https://cdn.shopify.com/s/files/1/0433/8650/3326/files/pabigodewibuwoxetu.pdf
    • https://cdn.shopify.com/s/files/1/0429/2352/4259/files/aadhar_card_online_update_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/0253/5840/files/rukebobolubeluv.pdf
    • https://cdn.shopify.com/s/files/1/0427/7505/2454/files/biblia_ortodoxa_vechiul_testament.pdf
    • https://cdn.shopify.com/s/files/1/0430/8375/9765/files/grimm_season_5_torrents.pdf
    • https://cdn.shopify.com/s/files/1/0439/9765/9294/files/kowokoselidogegejekivafo.pdf
    • https://cdn.shopify.com/s/files/1/0440/5025/1941/files/dobig.pdf
    • https://cdn.shopify.com/s/files/1/0434/7605/8274/files/importance_of_after_sales_service_to_customers.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_off000054e1.bin
a86c5490ab1cd8dba5bf1797a95908b1384bfcd665251a4623daae220c627de2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54E1 5044 bytes
font_01_sfnt_off000065f2.bin
003b06d6711c3e6afce14c25f12f8a690be67f80abe9dc0e8e077b4236162189		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65F2 11092 bytes

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