Malicious PDF — malware analysis report

Static analysis result for SHA-256 75fe12235e071a2e…

MALICIOUS

PDF

43.1 KB Created: 2020-08-31 15:35:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a4e711ed91f2c77064d0fa3ecca47e8 SHA-1: 26c7125f9e0015c4ab7c0ebd26f44623be2a04b8 SHA-256: 75fe12235e071a2e6d17186523a6e3d538c1e5f079192868888f38cf5dace084
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector at `https://ttraff.com/pify?keyword=atoms+review+worksheet+answers`. This suggests the document is part of a link farm or phishing campaign designed to redirect users to malicious sites. The ML classifier also 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.com/pify?keyword=atoms+review+worksheet+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/28675551988.pdf
    • https://cdn.shopify.com/s/files/1/0432/3121/5780/files/fe_civil_review_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0945/files/90766742459.pdf
    • https://cdn.shopify.com/s/files/1/0450/9528/8984/files/steam_blanching.pdf
    • https://cdn.shopify.com/s/files/1/0439/2629/0587/files/kadukufadut.pdf
    • https://static.usrfiles.com/ugd/191a6d_98f7ed09b81f4c528bcc728f03b1d39c.pdf
    • https://static.usrfiles.com/ugd/de65f7_bcc03de399044503b58db698245e53e6.pdf
    • https://static.usrfiles.com/ugd/c7ef1a_b04bc25fb13247ee93d0692e26d7cd42.pdf
    • https://cdn.shopify.com/s/files/1/0435/4143/0440/files/veserukabenigegud.pdf
    • https://cdn.shopify.com/s/files/1/0432/6968/5414/files/48079572055.pdf
    • https://cdn.shopify.com/s/files/1/0438/0593/3730/files/piwomodilujukaxalawisemiz.pdf
    • https://cdn.shopify.com/s/files/1/0427/6197/8023/files/mcgraw_hill_accounting_answers_chapter_13.pdf
    • https://cdn.shopify.com/s/files/1/0432/1627/3563/files/92520588019.pdf
    • https://static.usrfiles.com/ugd/cf14a4_0422a1528ae5466fb97b23a8c8c84821.pdf
    • https://static.usrfiles.com/ugd/3de8a6_50d593f41bd04584b6e2755f98e22915.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_off00006a68.bin
859b77d7666a3738176548c95a204fcdd55f9b36d53dd1f93dddae016830fbc7
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A68 5100 bytes
font_01_sfnt_off00007ba7.bin
7df1ab48b3008acc22a4a7e34b507e7008c89e36c57801688a827ebff51cae39
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BA7 10436 bytes