Malicious PDF — malware analysis report

Static analysis result for SHA-256 9effbdd51149691f…

MALICIOUS

PDF

41.4 KB Created: 2020-08-17 04:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7dee5e61e2915187145ebc2210bd2ba SHA-1: b941f9ce1a94e090d7de70c874f7866b86aab086 SHA-256: 9effbdd51149691f883110ef1f674e670e1b98c8628bd6b79dc40f338f26499f
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text related to "Fnma student loan guidelines" and the malicious URL, suggesting a phishing or scam lure. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm designed to distribute malicious content.

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=fnma+student+loan+guidelines
    • http://sunizawot.royalvacationtravel.com/uploads/1/3/1/6/131637814/xibevosu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3549/1490/files/python_fizzbuzz_one_line.pdf
    • https://cdn.shopify.com/s/files/1/0431/7177/4615/files/4428822684.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/teacher_interview_questions_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/43187261926.pdf
    • https://cdn.shopify.com/s/files/1/0436/8482/3205/files/gavunuvekujonefirelovuzi.pdf
    • https://cdn.shopify.com/s/files/1/0428/4992/7327/files/36594819950.pdf
    • https://cdn.shopify.com/s/files/1/0434/1386/4604/files/cocoyam_starch.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4016/files/kupofapedesipafegulozu.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_off00006418.bin
3e0f483cb38324e55dc926046644f643847b2fc8b16e678e57667fb54208f290		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6418 5004 bytes
font_01_sfnt_off00007504.bin
d8eb66a0ba33e619d66b6e6943de31a8a9b9902edb2e9487aeb0b698cc2a9fa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7504 10640 bytes

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