Malicious PDF — malware analysis report

Static analysis result for SHA-256 236a55bfbde862f7…

MALICIOUS

PDF

41.6 KB Created: 2020-08-30 09:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3b871d8a5faa57fd4b50434d78bc4c3 SHA-1: 088895ddf180018d0a74176a2404158aff104fc6 SHA-256: 236a55bfbde862f721dbf06ace72b78e6992f0ac259be06889d7d148b8a355a8
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with a critical heuristic firing indicating a link farm pointing to a malicious redirector. The primary malicious URL identified is ttraff.com, which is likely used to obscure the final destination of the attack. The presence of numerous benign-looking Shopify links suggests an attempt to blend malicious traffic with legitimate content.

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=panasonic+sc+htb8
    • https://cdn.shopify.com/s/files/1/0430/0190/5315/files/academic_english_words_with_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0463/4853/3917/files/arise_past_perfect_form.pdf
    • https://cdn.shopify.com/s/files/1/0437/8794/4096/files/fufafi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4606/7605/files/duzujopiletem.pdf
    • https://cdn.shopify.com/s/files/1/0429/1756/0473/files/87870374236.pdf
    • https://cdn.shopify.com/s/files/1/0438/3349/1606/files/avoir_etre_faire_aller.pdf
    • https://cdn.shopify.com/s/files/1/0432/8210/4478/files/toefl_ibt_test_questions.pdf
    • https://cdn.shopify.com/s/files/1/0428/7427/3948/files/aptis_test_pre_exam_workbook_download.pdf
    • https://static.usrfiles.com/ugd/a2e20a_c40c355d95a64af88cf2d92e9e8bbca0.pdf
    • https://static.usrfiles.com/ugd/b8c837_715b3b0863494b5c9aad156621a73024.pdf
    • https://static.usrfiles.com/ugd/4c1554_a870737e7e3740b99d88ebb8dbb96a9a.pdf
    • https://static.usrfiles.com/ugd/b8c837_55d9617a8c86423a9f1b3d48f3c18a84.pdf
    • https://static.usrfiles.com/ugd/b8c837_5838c8f1798b4f7faba07b119040f1ba.pdf
    • https://static.usrfiles.com/ugd/b8c837_36f468c2b56047349a83bb289edc0dd2.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_off000065a6.bin
27a25f3a058ab2a5b1fed90885da5e3765c1a73e7ba7b82a202bdc4b9d9fe3e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x65A6 5096 bytes
font_01_sfnt_off000076ee.bin
d994bc69f86cc6b6cbd1a721c191c9606f2f6f35259f37bcbc8b7dadf750a647
pdf-font-stream PDF embedded font (sfnt) at offset 0x76EE 10380 bytes