Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a711efdaba0b34c…

MALICIOUS

PDF

33.2 KB Created: 2020-08-31 15:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52f0216d1cb33c0a5013d744bcdd6f4d SHA-1: 8837f9971bd332895ac5d3edccbd8ba0c081c779 SHA-256: 6a711efdaba0b34c3c3e97715c1c7ecd5f2746d9beaf8b6d97e2a28c333c7837
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high number of embedded external links, many of which point to redirector infrastructure or SEO link farms. The document body contains obfuscated text and a URL that appears to be part of a link farm. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to redirect users to malicious content, potentially for phishing or malware distribution.

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.link/wix?keyword=al+kahf+mishary
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/83b1b3_69c2f69a091e44fd96320eebea63359c.pdf
    • https://static.usrfiles.com/ugd/451461_1c2986d5671040fa909fabb7fe1858d6.pdf
    • https://static.usrfiles.com/ugd/b8c837_efc3a2a58ac94b36bb8b3bdd4e5be681.pdf
    • https://static.usrfiles.com/ugd/269bb8_9d05a0b3fce7428b8cf4b2c8e91c4f13.pdf
    • https://static.usrfiles.com/ugd/a4e402_cfac9e2697cc4cea96bbfaa207d69ab5.pdf
    • https://cdn.shopify.com/s/files/1/0437/5465/1799/files/47329902167.pdf
    • https://cdn.shopify.com/s/files/1/0466/3921/8853/files/98747654886.pdf
    • https://cdn.shopify.com/s/files/1/0435/2950/2874/files/82085616058.pdf
    • https://cdn.shopify.com/s/files/1/0428/4933/7507/files/61346179669.pdf
    • https://cdn.shopify.com/s/files/1/0432/4117/7252/files/turunarazuv.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1741436775.pdf
    • https://cdn.shopify.com/s/files/1/0432/3583/6072/files/69732609189.pdf
    • https://cdn.shopify.com/s/files/1/0432/3845/7504/files/loviluzerowowaridoz.pdf
    • https://cdn.shopify.com/s/files/1/0434/8110/4541/files/aqa_a_level_biology_required_practicals_answers.pdf
    • https://static.usrfiles.com/ugd/b8c837_6903332262864fe29263e593f599942b.pdf
    • https://static.usrfiles.com/ugd/f515ca_5af454040e7e4e9888d8675d38696069.pdf
    • https://static.usrfiles.com/ugd/d4a9d6_12f754a303534c2bbc846f7f9b16bf27.pdf
    • https://static.usrfiles.com/ugd/a4e402_67b803093b12466eaee2f3e09d520607.pdf
    • https://static.usrfiles.com/ugd/735424_61ce67f6dba94700bdb5f4ef2cd3e07a.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_off00004771.bin
22cb7c104e040a1f0887a4d4e90793f57693dc06f8c746334b4e131b1fb9cabd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4771 5160 bytes
font_01_sfnt_off000058e1.bin
6d6c4e9b21d87144197118ad9fb57ba1e794086d23c465dfdb4155d0f64bb09c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58E1 9196 bytes

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