Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb70835a6206a6d…

MALICIOUS

PDF

64.7 KB Created: 2020-08-29 00:30:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac653fe799c64e714ff4587233209612 SHA-1: 970cabe6ab6c9ea16a5f29963cd25c3815713a71 SHA-256: 6bb70835a6206a6d6afb7038e62362c1df1946af3c69ea005f40787e1f608a80
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious domain, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'the greatest showman albino twins' and a URL that appears to be part of a link farm. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the malicious redirector URL.

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.club/wix?keyword=the+greatest+showman+albino+twins
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6019/1651/files/23474086087.pdf
    • https://cdn.shopify.com/s/files/1/0428/3577/1558/files/21979308137.pdf
    • https://cdn.shopify.com/s/files/1/0427/7505/2454/files/behavioral_theory_of_management.pdf
    • https://cdn.shopify.com/s/files/1/0432/0336/2973/files/bupozoxav.pdf
    • https://cdn.shopify.com/s/files/1/0434/0154/3831/files/suwabedokomorabafijoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/2270/4030/files/98674947505.pdf
    • https://cdn.shopify.com/s/files/1/0432/7692/7134/files/water_pollution_malayalam.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/xijiniwedagevu.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8758/files/26173327737.pdf
    • https://cdn.shopify.com/s/files/1/0432/0490/3073/files/1038821431.pdf
    • https://cdn.shopify.com/s/files/1/0437/9086/0449/files/bafofijorokabebulala.pdf
    • https://cdn.shopify.com/s/files/1/0431/3497/6157/files/5530717644.pdf
    • https://static.usrfiles.com/ugd/b8c837_fee71b3bd88146f2b0e4431291e2abf5.pdf
    • https://static.usrfiles.com/ugd/b8c837_92747f49a4494faa82a38d86f85e7e14.pdf
    • https://static.usrfiles.com/ugd/b8c837_2e96e287717143d9baa199985c5b2211.pdf
    • https://static.usrfiles.com/ugd/b8c837_fc32b6cedbef484faf48999893429c8d.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_off0000be84.bin
b4cebf9d83fc1e6d5d146a830a0daaa24f34dd0cc5debc84af8c7c514ae31f0d
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE84 5280 bytes
font_01_sfnt_off0000d070.bin
ba4ec5bfaa4378eb2cf85ee87045e6e7a46833ebb6aff00955187e4f2d2ba8e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xD070 10824 bytes