Malicious PDF — malware analysis report

Static analysis result for SHA-256 897f623a61e4dd61…

MALICIOUS

PDF

43.3 KB Created: 2020-07-27 15:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd23c6169ce4836b4dac863044466a4a SHA-1: cdbe790c706d43e4a3bc5ede01f0e927fe717a13 SHA-256: 897f623a61e4dd61e36a012f31054bb6d05365e83b673b8ae663ec58181e0fe3
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, appears to contain keywords related to educational materials, suggesting a lure. The primary malicious URL identified is ttraff.cc, which is used to redirect users to other sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.cc/pify?keyword=grade+7+math+test+with+answers+pdf
    • http://files.bidittle.com/uploads/1/3/0/7/130775163/3998173.pdf
    • http://files.mscbmx.com/uploads/1/3/0/8/130874522/rajexeditudomuko.pdf
    • http://files.highpeaks1stgrade.com/uploads/1/3/0/9/130969709/4b911.pdf
    • https://cdn.shopify.com/s/files/1/0431/6112/5015/files/pofesi.pdf
    • https://cdn.shopify.com/s/files/1/0439/2953/4632/files/79471740403.pdf
    • https://cdn.shopify.com/s/files/1/0429/8558/6841/files/dememuge.pdf
    • https://cdn.shopify.com/s/files/1/0428/7083/3319/files/6761571996.pdf
    • https://cdn.shopify.com/s/files/1/0430/2890/6138/files/81890554859.pdf
    • https://cdn.shopify.com/s/files/1/0433/5796/2405/files/57184622409.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/salelixakibikiziz.pdf
    • https://cdn.shopify.com/s/files/1/0427/7967/2735/files/61703377603.pdf
    • https://cdn.shopify.com/s/files/1/0437/3151/7605/files/kizup.pdf
    • https://cdn.shopify.com/s/files/1/0429/9826/8065/files/dorosotiduzuzizonar.pdf
    • https://cdn.shopify.com/s/files/1/0428/7696/0924/files/81769289288.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/
    • https://cdn.shopify.com/s/files/1/0

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a92.bin
1f6f014b004b18460acdab7cecc6d48cefbf2a9f3ea06558115cf96d558ea3c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A92 5128 bytes
font_01_sfnt_off00007bf6.bin
d62d1648754d5c04a7800f92884871e39bb574149305aa3ba7dfe92a06d12b0d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BF6 10552 bytes