Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3674eed55dfc49…

MALICIOUS

PDF

41.4 KB Created: 2020-08-04 02:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8df0784c9fa86dbf27195ff1b4c150b6 SHA-1: 3c977600df937366be0871072981de7b2119d0cf SHA-256: 8c3674eed55dfc49ee99f891e65fc34b2daa6f42733827617c391526973dbd1b
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=basic+c+language+interview+questions+pdf'. This URL is presented within the document body, disguised as interview questions, to entice users to click. The file also exhibits characteristics of a link farm, with numerous embedded URLs, many of which are hosted on Shopify but some point to unknown domains. 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=basic+c+language+interview+questions+pdf
    • http://files.shellybroughtonart.com/uploads/1/3/1/4/131453086/gemuz_kipizog_fasogaluwe.pdf
    • http://files.losososfitness.com/uploads/1/3/1/6/131606630/694400.pdf
    • http://files.inquirybuddies.com/uploads/1/3/0/9/130969845/9947500.pdf
    • http://ponima.helenwasielewski.com/uploads/1/3/0/7/130738696/miwise-negiwib-tenemifa-dixugane.pdf
    • https://cdn.shopify.com/s/files/1/0429/2725/9811/files/guwuvobixalezigi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3593/4370/files/80995563063.pdf
    • https://cdn.shopify.com/s/files/1/0437/0379/5877/files/azolla_cultivation_malayalam.pdf
    • https://cdn.shopify.com/s/files/1/0432/2371/1903/files/rukegibijasepax.pdf
    • https://cdn.shopify.com/s/files/1/0427/4854/3142/files/56028971968.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/medade.pdf
    • https://cdn.shopify.com/s/files/1/0430/6200/1825/files/zelusolalejomagerak.pdf
    • https://cdn.shopify.com/s/files/1/0440/5251/2918/files/stardew_valley_item_id.pdf
    • https://cdn.shopify.com/s/files/1/0429/6998/9279/files/pewawe.pdf
    • https://cdn.shopify.com/s/files/1/0431/8239/1451/files/paxurexima.pdf
    • https://cdn.shopify.com/s/files/1/0430/4669/9165/files/4032578158.pdf
    • https://cdn.shopify.com/s/files/1/0433/0615/6190/files/daruwevuxefolimizegis.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/38746106010.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_off0000633e.bin
d65e571e99db17133b41009f3b69ed52b64ffba69323c72fbb0c7757d0795f2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x633E 5652 bytes
font_01_sfnt_off00007696.bin
e81287ad4cfd661270d3f8a77013aa40407b7d0e552b4774f5ab798b546163d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7696 9960 bytes

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