Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e21c0cb621c6539…

MALICIOUS

PDF

41.7 KB Created: 2020-08-29 04:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc5fc7053e3c17c92aec30438ca1838e SHA-1: 6cdc82f12aaef8f108ed937e390d863146ae7aa6 SHA-256: 0e21c0cb621c6539ff39fd2a74aca223cf0830822a8514fc70f3c94c9f349dcb
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, disguised as "Nevada real estate test questions". This indicates a phishing or scam attempt, likely delivered as a spearphishing attachment. The ML classifier strongly supports the malicious verdict. No scripts were extracted, but the presence of embedded URLs and the redirector link are strong indicators of malicious intent.

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/wix?keyword=nevada+real+estate+test+questions
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_9f2ddb608771465eb769970733923c65.pdf
    • https://static.usrfiles.com/ugd/b8c837_c123ef46c14a4e32b596a54140c5d46a.pdf
    • https://static.usrfiles.com/ugd/b8c837_7542c7f67ad24ae6b4c755e5b9fd0709.pdf
    • https://static.usrfiles.com/ugd/b8c837_fd3659b497844cf6a7dd355e08143771.pdf
    • https://static.usrfiles.com/ugd/b8c837_4b5dd9cdd6584393835540a1e9ad4517.pdf
    • https://cdn.shopify.com/s/files/1/0436/0844/0995/files/ccna_cisco_certified_network_associate_study_guide_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0440/2659/3445/files/sinonexabajavugipiwiza.pdf
    • https://cdn.shopify.com/s/files/1/0428/1407/9143/files/sugutesewuwufivere.pdf
    • https://cdn.shopify.com/s/files/1/0432/3550/8387/files/soda_keygen.pdf
    • https://cdn.shopify.com/s/files/1/0428/9586/8057/files/83651766699.pdf
    • https://cdn.shopify.com/s/files/1/0436/2534/9283/files/soluwib.pdf
    • https://cdn.shopify.com/s/files/1/0437/3191/0821/files/divorce_application_form_victoria.pdf
    • https://cdn.shopify.com/s/files/1/0432/2210/6271/files/english_lesson_plan_d._el._ed.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_off000063ed.bin
a9cb690c9bd5fdd6a7b02f3c4300d9dfb74e0476fa23b3512cd661f8f6e24529
pdf-font-stream PDF embedded font (sfnt) at offset 0x63ED 4972 bytes
font_01_sfnt_off000074ec.bin
5a5e49d5d6b36c4c1d4726b7e5be98ed1328a66880bb2f6216edbf4b3307411a
pdf-font-stream PDF embedded font (sfnt) at offset 0x74EC 10976 bytes