Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a3b57e6302d982c…

MALICIOUS

PDF

32.6 KB Created: 2020-08-12 07:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba3a6b50290463b4e042e2b0203e10b7 SHA-1: f4185857a4e5a57d9e3b586fae0a9bef185ddfcd SHA-256: 8a3b57e6302d982cbdc01403e898369da81e25de76d49db29e98b2a0a9042d3b
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, a common tactic for SEO spam and phishing. One critical heuristic identified a link to a known malicious redirector infrastructure at ttraff.ru, which is likely used to obscure the final malicious destination. The document body, though heavily corrupted, contains keywords related to a product manual, suggesting a lure to trick users into clicking the malicious link.

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/wb?keyword=olimpia%20splendid%20unico%20star%20manual
    • http://files.learningforcharity.ca/uploads/1/3/2/6/132695432/8496480.pdf
    • http://kuwule.kesara.org/uploads/1/3/1/0/131069934/kemufewotuvemiwij.pdf
    • http://files.johnsonhousebullies.com/uploads/1/3/1/4/131438464/zuragitetikumitataku.pdf
    • http://files.bickley-green.com/uploads/1/3/2/6/132695321/25d481.pdf
    • https://cdn.shopify.com/s/files/1/0436/9845/4682/files/pewofafanedixeteruseg.pdf
    • https://cdn.shopify.com/s/files/1/0436/1207/8243/files/sawoxaduzanufifamixinoni.pdf
    • https://cdn.shopify.com/s/files/1/0448/0165/4935/files/visual_studio_code_change_terminal.pdf
    • https://cdn.shopify.com/s/files/1/0431/8288/2980/files/fejorexerolifuw.pdf
    • https://cdn.shopify.com/s/files/1/0432/6657/2452/files/zanokalisenifapovezakok.pdf
    • https://cdn.shopify.com/s/files/1/0431/1344/7581/files/vanivajepiradevawizevero.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9221/files/pension_actuarial_mathematics.pdf
    • https://cdn.shopify.com/s/files/1/0429/1110/5183/files/loving_yourself_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xazijejizamoketabuguta.pdf
    • https://cdn.shopify.com/s/files/1/0427/4061/3286/files/raferonufopuvusevig.pdf
    • https://cdn.shopify.com/s/files/1/0435/9792/2461/files/15232373026.pdf
    • https://cdn.shopify.com/s/files/1/0429/2024/7462/files/11462540569.pdf
    • https://cdn.shopify.com/s/files/1/0432/2433/4496/files/61224239954.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_off000044c1.bin
fd7d0646c584030ba68a0548607886b97e3cdfb92da9fc822ecb79b93f6aefb6
pdf-font-stream PDF embedded font (sfnt) at offset 0x44C1 5248 bytes
font_01_sfnt_off0000566e.bin
4c0889211e31fa3c72886484b07cb7af0ecf68c89fa5e71d9e921262a1449f18
pdf-font-stream PDF embedded font (sfnt) at offset 0x566E 9112 bytes