Malicious PDF — malware analysis report

Static analysis result for SHA-256 7285afb2c5c90dbb…

MALICIOUS

PDF

40.4 KB Created: 2020-09-09 16:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06d6fe86e8ef018cfc2f527aa21b01c4 SHA-1: f6d23dda61b4b2f4baf1640ca80305f8c653dcd1 SHA-256: 7285afb2c5c90dbba1c3bc075103bbb2a568bedc12a018810d6de85d81ae6d79
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. One of these links, 'https://ttraff.me/wix?keyword=blender+2.+79.+6', is flagged as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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.me/wix?keyword=blender+2.+79.+6
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/76156b_03e9bd598b234a16b754a49f961c18cd.pdf
    • https://static.usrfiles.com/ugd/9058e5_5158225bd1604adabb11021b8ee6d581.pdf
    • https://static.usrfiles.com/ugd/bb13a2_2d503c56a3b545cdbb9a7a1f4f6a859f.pdf
    • https://static.usrfiles.com/ugd/78c764_8b2caf40a29f4060a97f47c90114ae06.pdf
    • https://cdn.shopify.com/s/files/1/0429/8027/8426/files/ditomibomivota.pdf
    • https://cdn.shopify.com/s/files/1/0430/7222/5442/files/edmentum_assessments_answer_key_econ.pdf
    • https://cdn.shopify.com/s/files/1/0466/8814/1476/files/sorry_fire_and_ice_rules.pdf
    • https://cdn.shopify.com/s/files/1/0454/3024/3484/files/30749204630.pdf
    • https://cdn.shopify.com/s/files/1/0436/9969/9866/files/wow_windwalker_monk_guide_noxxic.pdf
    • https://cdn.shopify.com/s/files/1/0432/3462/3643/files/dovimobatuvikesezetavi.pdf
    • https://cdn.shopify.com/s/files/1/0438/2310/4160/files/myred_unl_edu_blackboard.pdf
    • https://static.usrfiles.com/ugd/ab63e3_99cdeb9696f0436e9beba7310259baab.pdf
    • https://static.usrfiles.com/ugd/74e905_86a185e44d2b4066a7663ffb33c06b74.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_off0000606b.bin
740df3d2cc069b3157e644eac727bc93158737fb9aeeb66592a022128cedfefc
pdf-font-stream PDF embedded font (sfnt) at offset 0x606B 5036 bytes
font_01_sfnt_off000071a2.bin
ba7f2c5aa742a43444209a779fdf3d32fa30b3143f63935f88de8bcdc194eb4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x71A2 10392 bytes