Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a61803a102fed5…

MALICIOUS

PDF

46.6 KB Created: 2020-08-29 16:40:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d191c12443010d5538a40de225f5bef SHA-1: 576c238587d46b0fce8b8499c9c13224abde8b4e SHA-256: 98a61803a102fed5af910c7016f9c29d5bb094e22d8697da028d0f69d1901e5d
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at 'https://ttraff.ru/wix?keyword=pentax+k1000+guide'. This suggests a phishing or social engineering attack, aiming to redirect the user to malicious infrastructure. The presence of a large number of other links, many pointing to Shopify, indicates a potential link farm or SEO poisoning attempt to disguise the malicious intent. No scripts were extracted, but the PDF structure and embedded links strongly indicate a malicious redirection attempt.

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.ru/wix?keyword=pentax+k1000+guide
    • https://cdn.shopify.com/s/files/1/0436/6611/2662/files/93237805466.pdf
    • https://cdn.shopify.com/s/files/1/0459/5675/9711/files/viribu.pdf
    • https://cdn.shopify.com/s/files/1/0428/6103/5686/files/20263994030.pdf
    • https://cdn.shopify.com/s/files/1/0432/2259/7800/files/boss_rc_3_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/59413257754.pdf
    • https://cdn.shopify.com/s/files/1/0438/3630/9666/files/feelings_buried_alive_never_die.pdf
    • https://cdn.shopify.com/s/files/1/0434/0498/4474/files/46602902978.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/45366335679.pdf
    • https://cdn.shopify.com/s/files/1/0430/4424/1562/files/anemia_de_fanconi.pdf
    • https://cdn.shopify.com/s/files/1/0435/3510/6203/files/roll20_macro_commands.pdf
    • https://static.usrfiles.com/ugd/3649d2_6fd54fcb0d204808a424ab562a133e6a.pdf
    • https://static.usrfiles.com/ugd/b56239_1f8b34de1d8b4493a2438d052b3bd6ed.pdf
    • https://static.usrfiles.com/ugd/b8c837_8d20a3fe6cb94fe98d3abbb09b34781c.pdf
    • https://static.usrfiles.com/ugd/b8c837_992f0d430cf3468286aeb16cf15a841c.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed96ab30fe9b4985bb31f55e0049d212.pdf
    • https://static.usrfiles.com/ugd/b42fd6_c091290a208f46d8b8c893c13f0d8438.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_off00007934.bin
a952a18a528a432855d16d92e97bee40513ef16ed7ee6f4267477397486e4b77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7934 5012 bytes
font_01_sfnt_off00008a56.bin
eef27e1f9ae75c01764f2f399c241f6ab455d16a2ea2b0364783d0f06ede4068		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A56 10364 bytes

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