Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8758736623cdbb1…

MALICIOUS

PDF

44.1 KB Created: 2020-09-01 19:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9338e975338ee5ea7d8415f4057b9a6 SHA-1: aeebf6a4c3ef0bbe9c34d913c3e7813613f85626 SHA-256: b8758736623cdbb184664d12620eb37f83a76c601530da8333b3e30eb3641cce
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link disguised as a calendar resource, which redirects to a known malicious domain. The PDF also features a large number of links to other PDFs hosted on Shopify, likely for SEO manipulation to improve search engine ranking for malicious content. The ML classifier 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=2020+calendar+with+week+numbers+excel
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/lerokagat.pdf
    • https://cdn.shopify.com/s/files/1/0434/2461/2508/files/joburg_city_power_fault_reporting.pdf
    • https://cdn.shopify.com/s/files/1/0434/9162/3077/files/3022859671.pdf
    • https://cdn.shopify.com/s/files/1/0433/6356/5718/files/witepuxa.pdf
    • https://cdn.shopify.com/s/files/1/0438/6127/8885/files/blob._io_mod_apk.pdf
    • https://static.usrfiles.com/ugd/b8c837_b34f62ec83c045cb9e642d86486e82c6.pdf
    • https://static.usrfiles.com/ugd/0df15e_32dee0d795654942a094b19c3f3d7f71.pdf
    • https://cdn.shopify.com/s/files/1/0433/8122/7670/files/87022294277.pdf
    • https://cdn.shopify.com/s/files/1/0431/9651/4461/files/64416753816.pdf
    • https://cdn.shopify.com/s/files/1/0431/7439/6063/files/83143471728.pdf
    • https://cdn.shopify.com/s/files/1/0429/8381/7375/files/love_yourself_answer_album_inside.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7100/files/chris_brown_2005_album_download.pdf
    • https://static.usrfiles.com/ugd/18f527_f1928f63d6aa403d96c4762d40ff6de2.pdf
    • https://static.usrfiles.com/ugd/b8c837_f0d9ea0f57004c04b51958ec8cf844ae.pdf
    • https://static.usrfiles.com/ugd/74e905_46af3d8b667f45bd9b1a8ab834caa110.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006cd2.bin
a7289ab7d2c686c410d5f10b24f19f1c4b89b7190a9df3b2e46e654481d4b604
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CD2 5720 bytes
font_01_sfnt_off00008028.bin
9a326e17ba28514663557b130c40ce2b3d464dd899e0e28181eb5d31ad8f842b
pdf-font-stream PDF embedded font (sfnt) at offset 0x8028 10460 bytes