Malicious PDF — malware analysis report

Static analysis result for SHA-256 c25c2f45ea53f5bf…

MALICIOUS

PDF

37.3 KB Created: 2020-08-18 19:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77b120c801fe8d4c641bdb311ed39467 SHA-1: ea37ec2aa194ca07f27d2c2784324ea017b59487 SHA-256: c25c2f45ea53f5bffc5f0ed76dd5cfa0778a4184da3ca2a3b44e3a5506972e00
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a malicious redirector link, and another flagged the document as a link farm. The document body, though partially obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=exercise+simple+present+tense+with+answer', which is likely intended to lure the user to a malicious site under the guise of a certificate sample. No scripts were extracted from this sample.

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=exercise+simple+present+tense+with+answer
    • http://pijikemuf.marcatunm.org/uploads/1/3/1/4/131453870/403a093.pdf
    • http://files.mikewritesabit.org.uk/uploads/1/3/0/7/130738859/dakevetojar.pdf
    • http://files.drheatherloenser.com/uploads/1/3/0/9/130969334/deabd0921c416a.pdf
    • http://tudobas.artscollective.co.nz/uploads/1/3/0/7/130738615/7962e6c20084c.pdf
    • http://files.ohboreumoh.com/uploads/1/3/1/4/131407655/domogosuzipigod.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/civil_work_experience_certificate_sample.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34007792176.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7614/files/madelexane.pdf
    • https://cdn.shopify.com/s/files/1/0434/5423/4785/files/bijadas.pdf
    • https://cdn.shopify.com/s/files/1/0431/1266/1152/files/10424166336.pdf
    • https://cdn.shopify.com/s/files/1/0431/3051/9716/files/likimasavafuxefelefukijuz.pdf
    • https://cdn.shopify.com/s/files/1/0428/0143/0695/files/50349474133.pdf
    • https://cdn.shopify.com/s/files/1/0437/9148/3041/files/wegepopumat.pdf
    • https://cdn.shopify.com/s/files/1/0431/9268/0605/files/70555224909.pdf
    • https://cdn.shopify.com/s/files/1/0432/5317/0334/files/33682824284.pdf
    • https://cdn.shopify.com/s/files/1/0434/3015/0309/files/39399030215.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_off00005345.bin
eb2bf7790febc7c28e8c0174dd509d5343ab760b228682394da012fb394cc034		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5345 5292 bytes
font_01_sfnt_off00006525.bin
81fee605fd83f045cfa541b65a144a3ed0420e9504e3ba7520574b18f2b9b5b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6525 10248 bytes

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