Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b9f0a1d3673d259…

MALICIOUS

PDF

87.2 KB Created: 2020-08-15 01:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c60884a3e553c5253c2db3390e9bf2d SHA-1: d4803ae1ae5c54bbaf1a836565656d58f3ac760c SHA-256: 1b9f0a1d3673d25908faa0cf4558a7e612c9299758e9b691376b8fed17160789
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wb?keyword=aulika%20top%20manual'. Additionally, it exhibits a PDF link farm pattern, embedding numerous external links, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the redirector URL and appears to be a lure for a manual.

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/wb?keyword=aulika%20top%20manual
    • http://files.hiswordinpic.com/uploads/1/3/0/7/130739280/buxax.pdf
    • https://cdn.shopify.com/s/files/1/0430/2703/8369/files/clause_49_of_listing_agreement_2020.pdf
    • https://cdn.shopify.com/s/files/1/0443/9814/9798/files/sources_of_working_capital_finance.pdf
    • https://cdn.shopify.com/s/files/1/0432/9121/3980/files/59811411767.pdf
    • https://cdn.shopify.com/s/files/1/0434/4568/2328/files/advanced_life_support_in_obstetrics_book.pdf
    • https://cdn.shopify.com/s/files/1/0436/4166/7734/files/gatineau_park_ski_trails.pdf
    • https://cdn.shopify.com/s/files/1/0440/6539/0757/files/rugas.pdf
    • https://cdn.shopify.com/s/files/1/0432/6978/3720/files/vejazotorewarubodu.pdf
    • https://cdn.shopify.com/s/files/1/0437/9443/2161/files/9513683383.pdf
    • https://cdn.shopify.com/s/files/1/0429/2709/5967/files/50511411632.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107a3.bin
06316785ed64e97dd6cb3c1dca328f9e2a4c0ce1186fbb0a8e2301d879c01aed
pdf-font-stream PDF embedded font (sfnt) at offset 0x107A3 4508 bytes
font_01_sfnt_off000116cc.bin
c97f05efcf89fb6ceb7b97bc7b2c542e5224c48c2901b7e19d129b6c140f9d22
pdf-font-stream PDF embedded font (sfnt) at offset 0x116CC 13996 bytes
font_02_sfnt_off0001428b.bin
8405bb6ca9a6fb718a2e910e1cdde4d74ac2122cab0061dc5f772322db9c7ccd
pdf-font-stream PDF embedded font (sfnt) at offset 0x1428B 4324 bytes