Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c0d86445800bddc…

MALICIOUS

PDF

42.4 KB Created: 2020-09-08 19:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7041067069f8c7ef4c95fabe7e22250b SHA-1: 09cc066b83e5470970cd534fe18c9e89d692c4d3 SHA-256: 5c0d86445800bddc1adc967ed95db4e7a5d3d2e97862fd5060224d766f13d254
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector infrastructure, disguised as a printable calendar spreadsheet. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the primary malicious URL and several other URLs that appear to be part of a link farm, likely for SEO poisoning or to obscure the malicious destination.

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=printable+calendar+spreadsheet
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/cd81e9_4a6fb993d3d847a0970ad6fa0c56e1be.pdf
    • https://static.usrfiles.com/ugd/4f92c1_b2d3ab7c5e3f4520b2821ec80ba8fcf0.pdf
    • https://static.usrfiles.com/ugd/a2ebd8_5c115846a7cc4ad5b1bd81ee76327ea1.pdf
    • https://static.usrfiles.com/ugd/bcc0e4_28d37c409f3448679492cbe2c29f3382.pdf
    • https://static.usrfiles.com/ugd/cac9e4_ecd57a8e61dd48b6b5928321a11f7208.pdf
    • https://cdn.shopify.com/s/files/1/0431/5407/9904/files/lipanovewiwuvevo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1625/6662/files/punivuxatanejifexatevi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0695/0557/files/portillos_catering_menu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5013/0846/files/meperuvowataxudokefiremaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/8110/5562/files/70675898303.pdf
    • https://cdn.shopify.com/s/files/1/0432/8236/6629/files/51373747348.pdf
    • https://cdn.shopify.com/s/files/1/0435/1816/5146/files/slayer_leecher_v0._5.pdf
    • https://cdn.shopify.com/s/files/1/0438/4122/4869/files/94491085937.pdf
    • https://cdn.shopify.com/s/files/1/0433/1231/6584/files/34696514086.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_off00006831.bin
97c83beeeda21f7e17639e4b8aaa02a98577df8bc06029ed6d71a57c9c0923fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x6831 5300 bytes
font_01_sfnt_off00007a20.bin
50cdd4c45cd8ffadf13fbcfc0576f10d82b8438afe75be23fe010451af3fff70
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A20 10144 bytes