Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b468f3fe4c415a6…

MALICIOUS

PDF

42.6 KB Created: 2020-09-01 08:39:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b71c369ba03de29eba65d8775e26464 SHA-1: 95bfb2e1f4d7147e84f2011fbdb0cec17a92ef2a SHA-256: 5b468f3fe4c415a6d71f46fba4e9e2a36d1a6bf6d77841f15f7f4099f3f0c59c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of numerous links suggests an attempt to redirect the user to malicious sites, likely for phishing or SEO spam.

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.link/wix?keyword=lagu+a+million+pieces+kyuhyun
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/2058/2050/files/josopowe.pdf
    • https://cdn.shopify.com/s/files/1/0431/0899/1143/files/types_of_bearings_and_uses.pdf
    • https://cdn.shopify.com/s/files/1/0434/1393/0142/files/72432738500.pdf
    • https://static.usrfiles.com/ugd/cbe7f7_6a38c8889fea4e9182359312065b2677.pdf
    • https://static.usrfiles.com/ugd/5ed537_f2307db817e74ea8bcfa9f9657a2b2f3.pdf
    • https://static.usrfiles.com/ugd/b8c837_832aecef188b4b538cd4dcace800634b.pdf
    • https://static.usrfiles.com/ugd/6203b9_155533851e3a4707b8dff09e10595163.pdf
    • https://static.usrfiles.com/ugd/9ec29b_8fddee167a3c48c88bc872b886ed27a8.pdf
    • https://static.usrfiles.com/ugd/ee6770_cf8637b755b9413989abb6597a7c8c2f.pdf
    • https://static.usrfiles.com/ugd/98857b_a359643fc43848dca0efcb21d89f9cc6.pdf
    • https://static.usrfiles.com/ugd/4ae4db_f25c86899758417ba1134df776c2cc70.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/23313492251.pdf
    • https://cdn.shopify.com/s/files/1/0430/1501/2511/files/nivilozevopalodor.pdf
    • https://cdn.shopify.com/s/files/1/0438/9509/5464/files/jitimuwe.pdf
    • https://cdn.shopify.com/s/files/1/0430/5649/6791/files/vebutogusenuvazameragu.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fc4.bin
8a6525be3bfa44583b1451a8c7733d217bd3dc93b35b444653be6b7eba164424
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FC4 5360 bytes
font_01_sfnt_off000071ed.bin
3b2bb7fab666da1bcf104ee10780da4bf517c2eb9133752d60b8363ff5778d88
pdf-font-stream PDF embedded font (sfnt) at offset 0x71ED 14028 bytes