Malicious PDF — malware analysis report

Static analysis result for SHA-256 42bfc76e3253a192…

MALICIOUS

PDF

40.6 KB Created: 2020-08-14 09:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5549349bfed75b648d336536a19b347 SHA-1: 767b635aa8d3503944c24b37b282cc85bcda3c51 SHA-256: 42bfc76e3253a19202fe998b1a917fb22ad4b75d47e4da78f7aa65baf6c0a5f4
154 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains a significant number of embedded links. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=linearity+worksheet%2523+3'. Another critical heuristic indicated a PDF link farm, with many links pointing to Shopify domains, likely for SEO manipulation or to host further malicious content. The presence of numerous links suggests an attempt to distribute malicious content or phish users.

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/pify?keyword=linearity+worksheet%2523+3
    • http://files.drlauracano.com/uploads/1/3/1/3/131383821/rupuwafenone.pdf
    • http://files.str8coastin.com/uploads/1/3/1/4/131483361/najobajupuwoxo-pamodegujodava.pdf
    • http://wugatado.jonahnewton.com/uploads/1/3/0/7/130738524/majojexul-bilugavobalud-bugori.pdf
    • http://files.jacksonroadrunner.com/uploads/1/3/0/9/130969798/lukeg_tovabexiriwoge.pdf
    • http://files.xebex.eu/uploads/1/3/0/7/130775704/81f03fd54857.pdf
    • https://cdn.shopify.com/s/files/1/0432/7679/6057/files/70620472191.pdf
    • https://cdn.shopify.com/s/files/1/0430/3123/2674/files/best_app_linux.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zobirunutopuwipigodilig.pdf
    • https://cdn.shopify.com/s/files/1/0435/3749/8271/files/gewalurorobinomupa.pdf
    • https://cdn.shopify.com/s/files/1/0429/6019/1637/files/dojexusow.pdf
    • https://cdn.shopify.com/s/files/1/0431/1931/3053/files/vuzox.pdf
    • https://cdn.shopify.com/s/files/1/0441/3734/9272/files/evinrude_88_spl_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/1509/3917/files/aula_internacional_1_nueva_edicion_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/4621/4564/files/fevipepiwifobe.pdf
    • https://cdn.shopify.com/s/files/1/0429/5265/5002/files/46158276749.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xovigaza.pdf
    • https://cdn.shopify.com/s/files/1/0428/1165/4307/files/mathematics_for_economics_and_business_8th_edition_free_download.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_off000060a2.bin
4290a0ed09916f94239ee595e07e2d4b2f892fd5f6f3a9ab3577a29ef2276c89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60A2 4940 bytes
font_01_sfnt_off00007181.bin
d820a314db0b76eff07f72f783352033652177a756cc4e766c7df30ef11d259f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7181 10612 bytes

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