Malicious PDF — malware analysis report

Static analysis result for SHA-256 8efd71698f716401…

MALICIOUS

PDF

46.5 KB Created: 2020-08-12 02:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cde33e709f0d4ebeb9e68a527b1a0fb SHA-1: 804c3ea5ded90af25a859726c44b93b6e2773fb6 SHA-256: 8efd71698f7164013f74b9b0f179cba97be387d83e900a3fbb42c87ac7015251
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link to 'ttraff.ru' is flagged as a malicious redirector. This suggests the document is part of a link farm or SEO poisoning campaign, aiming to lure users to malicious sites. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted from this sample.

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=set+theory+and+logic+robert+stoll+pdf
    • http://fonuwe.habihabi.ca/uploads/1/3/1/1/131163635/4075009.pdf
    • http://files.teachersalad.com/uploads/1/3/0/8/130814208/rixutowigamige.pdf
    • http://dabaz.solerconsulting.com/uploads/1/3/1/1/131163864/2a343b614d7911.pdf
    • https://cdn.shopify.com/s/files/1/0433/1870/6341/files/21635222562.pdf
    • https://cdn.shopify.com/s/files/1/0434/2608/7064/files/fram_oil_filter_lookup.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32506959796.pdf
    • https://cdn.shopify.com/s/files/1/0435/6440/0798/files/shri_aditya_hridaya_stotra.pdf
    • https://cdn.shopify.com/s/files/1/0437/9767/6192/files/gakofukaz.pdf
    • https://cdn.shopify.com/s/files/1/0436/9462/0837/files/biology_class_11.pdf
    • https://cdn.shopify.com/s/files/1/0432/4796/0232/files/itextsharp_to_html.pdf
    • https://cdn.shopify.com/s/files/1/0436/4576/3744/files/kerosefifisubaf.pdf
    • https://cdn.shopify.com/s/files/1/0430/0659/1127/files/besejagakibizurato.pdf
    • https://cdn.shopify.com/s/files/1/0435/6328/6691/files/97908315426.pdf
    • https://cdn.shopify.com/s/files/1/0432/4986/0765/files/48414298897.pdf
    • https://cdn.shopify.com/s/files/1/0436/9842/1913/files/schneider_electric_lv_switchgear_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0437/3485/9927/files/70540037441.pdf
    • https://cdn.shopify.com/s/files/1/0434/0459/1271/files/psychological_trauma_theory_research_practice_and_policy.pdf
    • https://cdn.shopify.com/s/files/1/0436/0844/0990/files/jisevifibegu.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_off00007734.bin
a4b65e02d8d2e88d31da4f0b5f469cfc2845e0f722ce2c35f87c6398bcb2cc0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7734 5764 bytes
font_01_sfnt_off00008ac8.bin
d832b2b2f76a3e0848a1d1cfa73ac2b11a58573aad7895e354d15e074f476989		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AC8 10016 bytes

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