Malicious PDF — malware analysis report

Static analysis result for SHA-256 762cbe428d8c9063…

MALICIOUS

PDF

67.0 KB Created: 2020-08-10 23:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11bff85a2f0115c55391990c4f9e8ca0 SHA-1: 7ce977f90fe3dac6fa6c46411f8eebb631299d8b SHA-256: 762cbe428d8c9063ca34044f4dd751030a100b8b254bdbffa84a7c63e963fa88
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous links, many pointing to Shopify domains, but one critical link redirects to a known malicious domain (ttraff.cc). This indicates a phishing or redirection attack, likely aiming to deliver a payload or lead the user to a malicious site. The ML classifier strongly supports the malicious nature of this PDF. The document body, though heavily obfuscated, contains the malicious URL and text suggesting a 'handbook' lure.

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.cc/pify?keyword=centrifugal+fan+design+handbook+pdf
    • http://files.helpingusgrow.org/uploads/1/3/0/7/130740573/tutezamo.pdf
    • http://files.landsendguildofartists.co.uk/uploads/1/3/1/6/131606803/nirimakojunuk.pdf
    • http://files.laceramica.studio/uploads/1/3/1/3/131383456/xekeziguma.pdf
    • http://files.grovebaptist.org/uploads/1/3/2/6/132696621/1738460.pdf
    • https://cdn.shopify.com/s/files/1/0427/9674/4871/files/zokijesubakegejusamewi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/61238086127.pdf
    • https://cdn.shopify.com/s/files/1/0440/4540/2277/files/camara_de_comercio_colombia.pdf
    • https://cdn.shopify.com/s/files/1/0452/2714/7424/files/inductive_and_deductive_reasoning_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0447/1311/5802/files/31353480887.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pizegavegip.pdf
    • https://cdn.shopify.com/s/files/1/0432/0195/3952/files/neladew.pdf
    • https://cdn.shopify.com/s/files/1/0430/6301/7629/files/86621993796.pdf
    • https://cdn.shopify.com/s/files/1/0431/3497/6157/files/wexevepipomikoxonexonim.pdf
    • https://cdn.shopify.com/s/files/1/0438/0763/7661/files/panarizesajijinoruxi.pdf
    • https://cdn.shopify.com/s/files/1/0435/0178/1158/files/56836420168.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a95b.bin
11aa3507b0e7ecb3688e9a7e7416615ec8b910a6b155e46d58fd6af27c6d301a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA95B 5412 bytes
font_01_sfnt_off0000bba9.bin
45fcf82a4907e7b62dd26685797ccc0f02e79e35b824640bcc4b1cea1f009b66		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA9 14696 bytes
font_02_sfnt_off0000e9e6.bin
55678a5190ab32087fccd00ff40cb9ee825cafa424f9300e1d07390d3bf96976		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E6 16116 bytes

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