Malicious PDF — malware analysis report

Static analysis result for SHA-256 937361a6b38df9de…

MALICIOUS

PDF

41.7 KB Created: 2020-08-21 18:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de18aeab1181a40ffd8687742b5ae174 SHA-1: b37dae233520b9ce0fa10326ada823ada0dbd116 SHA-256: 937361a6b38df9de675b77cd14cb5541f7516477a9716d39b306b659bcba27c3
148 Risk Score

Malware Insights

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

The PDF contains a prominent link to 'ttraff.ru', identified as a malicious redirector. It also exhibits characteristics of a link farm, embedding numerous links to external PDFs, many hosted on Shopify. The document body, though partially corrupted, contains the lure text 'Free uba aptitude test questions and answers' and a URL matching the malicious redirector, reinforcing the phishing pretext. The presence of a call-to-action phrase and a callback lure further support a malicious intent.

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=free+uba+aptitude+test+questions+and+answers
    • http://vapafejiv.lunafiberartist.com/uploads/1/3/2/3/132303320/6834357.pdf
    • https://cdn.shopify.com/s/files/1/0429/6019/1637/files/levirodipitogufaxasonapew.pdf
    • https://cdn.shopify.com/s/files/1/0437/2670/0696/files/37315562909.pdf
    • https://cdn.shopify.com/s/files/1/0430/2916/8282/files/19762925047.pdf
    • https://cdn.shopify.com/s/files/1/0430/6003/5735/files/januxaw.pdf
    • https://cdn.shopify.com/s/files/1/0436/7283/0105/files/temajupiwemobu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7274/1791/files/ximanomus.pdf
    • https://cdn.shopify.com/s/files/1/0431/6263/2360/files/418394842.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6360/files/aptoide_minecraft_pe_0._14._0.pdf
    • https://cdn.shopify.com/s/files/1/0431/7760/7324/files/56467798647.pdf
    • https://cdn.shopify.com/s/files/1/0429/8876/5337/files/commercial_invoice_template_nz.pdf
    • https://cdn.shopify.com/s/files/1/0437/9289/2053/files/34325293710.pdf
    • https://cdn.shopify.com/s/files/1/0427/9291/1007/files/27870502087.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_off00006015.bin
ab3e73ad7ab3f231cfe16b6c926d1092ace71c0d7e17e9c257bc0b94cacaa463
pdf-font-stream PDF embedded font (sfnt) at offset 0x6015 5236 bytes
font_01_sfnt_off000071f9.bin
f9331f4bf100a57e9520367e02afe9e725008dec221e522e102c4ac34154d1d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x71F9 12108 bytes