Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a22db9a4a0d989…

MALICIOUS

PDF

47.4 KB Created: 2020-08-12 15:40:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6cc4121dcf8aaf2a9dccfb3944505f1 SHA-1: ea8d681b5fde3c6ed5a368d46e83f7d206db37e1 SHA-256: 91a22db9a4a0d989126159ac01ebce09e4aade0fe90628cd2a21b7041014cd4c
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The primary malicious URL identified is https://ttraff.com/pify?keyword=fluorescence+spectroscopy+instrumentation+pdf. The document body, though heavily obfuscated, also contains this URL, suggesting the intent is to redirect the user to malicious content. No scripts were extracted, and the PDF structure itself is the primary vector for the attack.

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.com/pify?keyword=fluorescence+spectroscopy+instrumentation+pdf
    • http://files.katgaddis.com/uploads/1/3/1/3/131383771/mawij.pdf
    • http://files.jaxntheboxtattoos.com/uploads/1/3/2/7/132712115/5361453.pdf
    • http://files.racingshoxsweden.com/uploads/1/3/0/7/130739835/4057089.pdf
    • http://files.shineonpro.com/uploads/1/3/1/4/131438330/bizobejogozikuzem.pdf
    • https://cdn.shopify.com/s/files/1/0437/4836/0343/files/6th_grade_reading_fluency_passages.pdf
    • https://cdn.shopify.com/s/files/1/0428/9550/7622/files/lapuwejikoxo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8227/6250/files/wiximusesufo.pdf
    • https://cdn.shopify.com/s/files/1/0437/6710/3645/files/muzazekugivasudij.pdf
    • https://cdn.shopify.com/s/files/1/0434/9689/8724/files/texturas_dibujo_arquitectonico.pdf
    • https://cdn.shopify.com/s/files/1/0428/8492/3555/files/texifizata.pdf
    • https://cdn.shopify.com/s/files/1/0434/3329/6028/files/acido_palmitico.pdf
    • https://cdn.shopify.com/s/files/1/0432/1358/6600/files/zufipumiduxexuwiwiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/9259/9193/files/28713356193.pdf
    • https://cdn.shopify.com/s/files/1/0431/3507/4465/files/65141289695.pdf
    • https://cdn.shopify.com/s/files/1/0429/2804/6233/files/54358867608.pdf
    • https://cdn.shopify.com/s/files/1/0429/6169/8969/files/running_total_java.pdf
    • https://cdn.shopify.com/s/files/1/0431/7046/3912/files/nesowufolekowatozigix.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_off00007c55.bin
993ff26f7220893784b6b2a0f97824abb3903e5d632793125dc971aba82c70b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C55 5360 bytes
font_01_sfnt_off00008e80.bin
d54a921a01c16d191a303c87a0a4dfa65d715e6ff3c01275d83c0d2b91aa041f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E80 10052 bytes

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