Malicious PDF — malware analysis report

Static analysis result for SHA-256 044ed13d922d2538…

MALICIOUS

PDF

39.9 KB Created: 2020-09-05 17:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f51963f64a1b49a1e46c33f0bbce2202 SHA-1: 330c52e998cb1a9b4f1a68123ee1b679defd7074 SHA-256: 044ed13d922d25388763f841117ee1a2ff09a410e706db00f002a0bc8dfc6bb0
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, ttraff.me, which is disguised as a weather report. The document body, though heavily obfuscated, also contains this URL. The PDF also features a large number of links to external PDFs, suggesting a link farm or SEO manipulation tactic. The ML classifier 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.me/wix?keyword=weather+report+chelmsford+ma
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/8de238_2112c3a4100341b781d1467d7635f763.pdf
    • https://static.usrfiles.com/ugd/a382ee_542ef4c924fb4c658fd99a2d07466491.pdf
    • https://static.usrfiles.com/ugd/628a76_8f0ff543f9da41aba78c6ea148d3d30c.pdf
    • https://static.usrfiles.com/ugd/0d089b_73c472d269b841479c397e81ae6c6e61.pdf
    • https://static.usrfiles.com/ugd/9374a7_a923af615e144bd8ada0fe85cf14472e.pdf
    • https://static.usrfiles.com/ugd/b8c837_11cf90d9264a4d69bbb1320605358a50.pdf
    • https://cdn.shopify.com/s/files/1/0438/7035/5611/files/colloquial_english_gareth_king.pdf
    • https://cdn.shopify.com/s/files/1/0439/7583/5806/files/98086509836.pdf
    • https://cdn.shopify.com/s/files/1/0433/5108/1118/files/reliability_centered_maintenance_excel_template.pdf
    • https://static.usrfiles.com/ugd/21e6f2_df2e23e8daca47f78dc3069bf5f46529.pdf
    • https://static.usrfiles.com/ugd/debbe1_71602dd12f984211a8c61e99e218b9f0.pdf
    • https://static.usrfiles.com/ugd/08e331_e6571593085e48feaea9cd0e55e5b26f.pdf
    • https://static.usrfiles.com/ugd/6fd45c_319eae6eee9b4ff680956a54093246d7.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005211.bin
4840047c3043a67c9e12d43f11ddf377d2435e028cc28010a66cfa7f5571c9c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x5211 5044 bytes
font_01_sfnt_off00006344.bin
a5b906017648e252bbc04ebf39ca97e372c8f22315fe6f8c19741b8847522609
pdf-font-stream PDF embedded font (sfnt) at offset 0x6344 9876 bytes
font_02_sfnt_off0000847d.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x847D 4324 bytes