Malicious PDF — malware analysis report

Static analysis result for SHA-256 67c583725bb4e42c…

MALICIOUS

PDF

42.2 KB Created: 2020-08-30 04:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae8499219386463b861cbec4b6e93175 SHA-1: 8a68daf454f3f19702d4d4b77bb6bcdbf402ffb2 SHA-256: 67c583725bb4e42ced0db7ce34ec48972c6236c1c1c8432c215ffbbeb133ce12
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to lure the user to a harmful site. The presence of a large number of external PDF links suggests a link farm or SEO poisoning attempt, further supporting malicious intent. The ML classifier also strongly flagged this PDF as malicious.

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/wix?keyword=louder+than+a+bomb+chicago
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/74c34a_b55bbd9b2db24b829463704ea0fb5872.pdf
    • https://static.usrfiles.com/ugd/f3ecbe_0431e7b7def444889782af593cb00204.pdf
    • https://static.usrfiles.com/ugd/345929_c822e354ee094c43b496422ba042f869.pdf
    • https://static.usrfiles.com/ugd/b8c837_8ded60dd0c584327880d28d0f3112874.pdf
    • https://static.usrfiles.com/ugd/37321e_12959e41f89142d9b45821560edc6d91.pdf
    • https://static.usrfiles.com/ugd/0c8cc8_9ce891789b0142d7b323315dc1e03233.pdf
    • https://static.usrfiles.com/ugd/d54300_07aea694ddc84fb7afafc305c4f2e49d.pdf
    • https://static.usrfiles.com/ugd/e3ff21_95b1c83e0c5f4a908b3b6e14e6479a39.pdf
    • https://static.usrfiles.com/ugd/b8c837_03d499f51e7b4a1eb8ad2d3b9e66bfb0.pdf
    • https://static.usrfiles.com/ugd/34e21e_f7ebc9ac1f794b688d3563f4b53bdcc9.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97253363073.pdf
    • https://cdn.shopify.com/s/files/1/0430/4656/8098/files/sample_application_letter_for_teacher_with_experience.pdf
    • https://cdn.shopify.com/s/files/1/0433/5376/8095/files/53566299760.pdf
    • https://static.usrfiles.com/ugd/7baf93_ffbed8c4396b43c0b5847209eaceb8dc.pdf
    • https://static.usrfiles.com/ugd/b8c837_1ea1c3959d844548b409d93a3d539406.pdf
    • https://static.usrfiles.com/ugd/ce5d00_11fb35a458d946fca77e6b50ec2c11d3.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_off0000677a.bin
5faa99e8526e77d53a815e8eefb4da5a3a51e9c2a367e1cd7a32a1c5d2502d1a
pdf-font-stream PDF embedded font (sfnt) at offset 0x677A 5224 bytes
font_01_sfnt_off00007914.bin
cf19c029cb94ea0a35165df39c46dda7fe292a36440321446a59b98a72374135
pdf-font-stream PDF embedded font (sfnt) at offset 0x7914 10256 bytes