Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc9886f29b66d59…

MALICIOUS

PDF

50.4 KB Created: 2020-09-02 00:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89127365a5324b222ec56f8b4b1107db SHA-1: 32709ae79728225ccbd60521f4bdbd4246be2f47 SHA-256: 3fc9886f29b66d594ad1ee9c67fd9bfc9cc1795458d5851ad1ba88081acc4f4e
120 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/wix?keyword=ap+calculus+bc+practice+exam+answer+key'. The document body, though heavily obfuscated, contains text related to 'Ap calculus bc practice exam answer key' and the malicious URL, suggesting a lure to trick users into clicking the link. The PDF also contains a link farm heuristic, indicating a large number of external links, many of which point to Shopify domains, likely to obscure the malicious redirector.

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.com/wix?keyword=ap+calculus+bc+practice+exam+answer+key
    • https://cdn.shopify.com/s/files/1/0427/8022/9791/files/cbse_class_12_chemistry_board_question_paper_2020_solved.pdf
    • https://cdn.shopify.com/s/files/1/0433/9616/9886/files/76961903660.pdf
    • https://cdn.shopify.com/s/files/1/0440/2606/9157/files/wakusatujinezet.pdf
    • https://cdn.shopify.com/s/files/1/0429/3741/7891/files/59376069016.pdf
    • https://cdn.shopify.com/s/files/1/0434/1966/4542/files/catheter_infection_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0440/9635/6504/files/sosejufolipoxojitonixuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/0958/0967/files/pe_exam_reference_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2836/files/63005561573.pdf
    • https://cdn.shopify.com/s/files/1/0432/4930/3720/files/kisonezimoloja.pdf
    • https://cdn.shopify.com/s/files/1/0438/2212/1122/files/13722306732.pdf
    • https://cdn.shopify.com/s/files/1/0452/6043/9713/files/betrayal_at_baldur_s_gate.pdf
    • https://cdn.shopify.com/s/files/1/0447/7665/2949/files/geboravorimimejafobe.pdf
    • https://cdn.shopify.com/s/files/1/0435/3500/7893/files/filokix.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a2e.bin
54504e3876d2b56d48d825510e957c2bd95af8faf237617f03d00f092afe8793		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A2E 5536 bytes
font_01_sfnt_off00007d02.bin
b495b986f37346256f84e5eaf630e223a07be431c2ceec0557c25b64c3f65503		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D02 10216 bytes
font_02_sfnt_off0000a008.bin
64f4eee5fc2db4af480378e18939e37c7ca95b958f48dde1d32b25051e823ebf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA008 18256 bytes

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