Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e56c4d108c2f568…

MALICIOUS

PDF

60.2 KB Created: 2020-08-03 21:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9efaea79e43a472271a18ea55a63003 SHA-1: 016a6a01ef29c51accc225e8b4a47c0b8d30e227 SHA-256: 2e56c4d108c2f56861ae83031c76f2197cfabd8668e0368a408d76e37f9391e8
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and contains a critical heuristic indicating it's a malicious redirector link. It also exhibits characteristics of a PDF SEO link farm, with numerous embedded links pointing to Shopify-hosted PDFs. The primary malicious IOC is the redirector URL, which likely leads to further malicious content. The document body is heavily obfuscated and contains embedded URLs.

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=turkic%20khaganate%20pdf
    • http://files.onequickchange.com/uploads/1/3/0/8/130813134/xivexanomedur_rugazesavew.pdf
    • http://files.stjacobselc.org/uploads/1/3/0/7/130739463/6639471.pdf
    • http://files.charleswmorganmodel.com/uploads/1/3/1/0/131071164/70cd9cc3988.pdf
    • http://files.grizzyathletics.com/uploads/1/3/0/7/130739693/a3a3f.pdf
    • https://cdn.shopify.com/s/files/1/0439/0102/6459/files/detinowakomojubedezij.pdf
    • https://cdn.shopify.com/s/files/1/0440/2656/0677/files/naluwafibitu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7279/0428/files/28295758770.pdf
    • https://cdn.shopify.com/s/files/1/0437/6893/8658/files/woxidenoda.pdf
    • https://cdn.shopify.com/s/files/1/0430/4325/8519/files/85640406549.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71409998288.pdf
    • https://cdn.shopify.com/s/files/1/0437/5815/7982/files/53050178915.pdf
    • https://cdn.shopify.com/s/files/1/0430/8185/9225/files/22662637905.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/2169313958.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/2857609843.pdf
    • https://cdn.shopify.com/s/files/1/0435/3510/6200/files/sunigezabim.pdf
    • https://cdn.shopify.com/s/files/1/0431/6217/3604/files/xilekiromiko.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_off0000876c.bin
a712a53b9f64d840169cd3bb761de9db68899ec43a51789ff2e4f78810630588		 pdf-font-stream PDF embedded font (sfnt) at offset 0x876C 12324 bytes
font_01_sfnt_off0000af45.bin
47c0e7cad7ef8ff0fed7cc9196e05eb5127ee5eb33282fac9d7d40186694e2fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF45 5220 bytes
font_02_sfnt_off0000c10c.bin
0bf6257238c778eccbd224a92ef2eaf3407dcc4b7ec963a8a09d1bb221c86776		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC10C 10112 bytes

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