Malicious PDF — malware analysis report

Static analysis result for SHA-256 2169551e1e5431d7…

MALICIOUS

PDF

39.8 KB Created: 2020-08-20 23:07:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e7a5c37378fc8d78f5b17ff100ff4ba SHA-1: 101a03a8f5652b7fdfedfaafe8d6fcb84485e470 SHA-256: 2169551e1e5431d760f774dfbeca47bc23da5ebe44406bb6238af95ef8c6aeed
152 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure. It also contains a large number of external links, many hosted on Shopify, suggesting a link farm. The primary malicious URL identified is https://ttraff.com/pify?keyword=post+workout+stretching+routine+pdf, which is likely used to redirect users to a phishing or malware site. The presence of a PDF_SEO_LINK_FARM heuristic further supports the attack pattern of using a large number of links to obscure malicious intent.

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.com/pify?keyword=post+workout+stretching+routine+pdf
    • http://kuserarew.ontariochristianchoir.com/uploads/1/3/0/7/130775951/d756aa8e3b09.pdf
    • https://cdn.shopify.com/s/files/1/0431/6925/1492/files/76877669723.pdf
    • https://cdn.shopify.com/s/files/1/0463/1802/6917/files/pipuwe.pdf
    • https://cdn.shopify.com/s/files/1/0440/0090/3318/files/assessment_for_learning_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/4578/1658/files/46705892261.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gevuruliwineda.pdf
    • https://cdn.shopify.com/s/files/1/0438/9902/7611/files/juzezulekuse.pdf
    • https://cdn.shopify.com/s/files/1/0434/1451/9973/files/25829143391.pdf
    • https://cdn.shopify.com/s/files/1/0450/6569/9478/files/the_economist_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/5696/3479/files/8698019650.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_off00005fc1.bin
cecb7bbbdc344014ee8160aeef58fbc9b1387e25489f29d8194f3f3187083834		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FC1 5332 bytes
font_01_sfnt_off000071f8.bin
ddd7dd7cacf87eb7af932ccdc164136b4644c2e9982161b037515d655858c57b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71F8 9588 bytes

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