Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c8de803fa0e3b25…

MALICIOUS

PDF

33.9 KB Created: 2020-09-12 09:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 865c6434db6d0b53412a3325ceb8a0cd SHA-1: 73b6b03da72c0e4b8f1ab434dc61d5e45f0dd05e SHA-256: 6c8de803fa0e3b254428027d81733fdcbef90e803cc324f4d8409d675481b5dc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, with one pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm or content hosting strategy. The ML classifier also flagged this PDF as malicious with high confidence.

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=shona+bible+free++for+android
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/80c1db_c04120c69c6846799ec48a24fa4b3d65.pdf
    • https://static.usrfiles.com/ugd/ac0094_312938b07b2240b58b0353c842f4811a.pdf
    • https://static.usrfiles.com/ugd/b8c837_43fe713b69d44bbd96c5c0c2bd08fd88.pdf
    • https://static.usrfiles.com/ugd/113e89_2787805e9f254ba1aeef6376c14bb617.pdf
    • https://static.usrfiles.com/ugd/837d34_508b05ae70a1437b870fac2e9c4f3c60.pdf
    • https://static.usrfiles.com/ugd/3b47cb_463fd2ee99054c24807c2a727da51846.pdf
    • https://static.usrfiles.com/ugd/a3b54b_72f1a69704ad4d588bb8639e64daf7a2.pdf
    • https://static.usrfiles.com/ugd/a2d007_ae268167b6374b169fb2e59335ae6a98.pdf
    • https://static.usrfiles.com/ugd/b18e4d_ebc38260316f4b0cb4c23ef8757e9fe3.pdf
    • https://static.usrfiles.com/ugd/0047a4_72d74298981c46b3a31ff662b57e857d.pdf
    • https://cdn.shopify.com/s/files/1/0432/8180/9558/files/29565005934.pdf
    • https://cdn.shopify.com/s/files/1/0431/4575/6821/files/55158942142.pdf
    • https://cdn.shopify.com/s/files/1/0434/9971/6770/files/zegosepit.pdf
    • https://cdn.shopify.com/s/files/1/0434/6878/3782/files/20346816750.pdf
    • https://cdn.shopify.com/s/files/1/0435/7105/2703/files/vowel_word_worksheets_for_kindergarten.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_off00004877.bin
e1361fcd2bb41e0815581aba711afae6a5740fcd2b1f7e6efc5ede0b39fda4d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x4877 5060 bytes
font_01_sfnt_off000059a1.bin
a3136553fb59acfaa41381f3e51fd329b19c809f5de1f327159a619bf739f74b
pdf-font-stream PDF embedded font (sfnt) at offset 0x59A1 9684 bytes