Malicious PDF — malware analysis report

Static analysis result for SHA-256 90046f048a66a07b…

MALICIOUS

PDF

47.1 KB Created: 2020-08-14 11:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3668f880dca6551cc8bdfbd1f76fe2ec SHA-1: 631b57345a2abf2518e24f032c5c78a950c7bdea SHA-256: 90046f048a66a07b5d5146ce663bff2c4fb656fabfe26d18dca529b69056704c
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.cc/wb?keyword=mahendra%20guru%20vocabulary%20pdf%20download`. This URL is likely part of a phishing or scam campaign designed to trick users into downloading malicious content or visiting further compromised sites. The document body, though heavily obfuscated, also contains this URL and a list of other URLs, many hosted on `cdn.shopify.com`, which are likely part of a link farm to improve search engine ranking for malicious content. The ML classifier also strongly flagged this PDF as malicious.

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/wb?keyword=mahendra%20guru%20vocabulary%20pdf%20download
    • http://files.steinhausbernese.com/uploads/1/3/1/4/131437984/tovefimusaragoxasim.pdf
    • http://files.m-agiostratitis.com/uploads/1/3/0/7/130739590/rafasamewabaw.pdf
    • http://files.isabelleclayart.com/uploads/1/3/2/6/132682882/nulirisogupe.pdf
    • https://cdn.shopify.com/s/files/1/0438/9791/3512/files/aristotle_s_nicomachean_ethics_book_1.pdf
    • https://cdn.shopify.com/s/files/1/0429/2296/7206/files/42681334821.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/40313354442.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9534/files/96266687238.pdf
    • https://cdn.shopify.com/s/files/1/0434/5197/3794/files/rectangular_to_polar_calculator.pdf
    • https://cdn.shopify.com/s/files/1/0434/7153/6285/files/13350266127.pdf
    • https://cdn.shopify.com/s/files/1/0435/4405/1864/files/95479466113.pdf
    • https://cdn.shopify.com/s/files/1/0432/0926/1217/files/32477277837.pdf
    • https://cdn.shopify.com/s/files/1/0439/1026/7035/files/860248212.pdf
    • https://cdn.shopify.com/s/files/1/0429/5104/9370/files/zasedam.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8839/files/sofomexesagafowujajedo.pdf
    • https://cdn.shopify.com/s/files/1/0434/8477/4552/files/94879896629.pdf
    • https://cdn.shopify.com/s/files/1/0432/7879/4917/files/15362458225.pdf
    • https://cdn.shopify.com/s/files/1/0432/4343/8244/files/dabinojuro.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_off00005c74.bin
c298d327437d3e67f73b0c747f8d7ce239988fc65ad7ad7b23e0c968a8492ba2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C74 5636 bytes
font_01_sfnt_off00006fb2.bin
7dd4eeaed35a6d34976cb7495658eeda75911c584423e66d921da02392c5b7dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB2 12608 bytes
font_02_sfnt_off000097ca.bin
d0193fa3530525d610f2b5f2b0f70beddee0b65ff8ef386500f74a5b0aa20cb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97CA 6872 bytes

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