Malicious PDF — malware analysis report

Static analysis result for SHA-256 0848dc16ecd82210…

MALICIOUS

PDF

50.1 KB Created: 2020-08-07 15:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b04c98060b6ac4b820ec8f444506747 SHA-1: e96e60b635f0089879f5e192b41ee0de9dc1446f SHA-256: 0848dc16ecd8221072390e99f1ffd3e89eeeacc4bc15fbb9896ab5622bec8528
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting PDF files, suggesting a link farm or SEO manipulation tactic. One prominent link, https://ttraff.ru/pify?keyword=epidemiologia+veterinaria+michael+thrusfield+pdf+gratis, is identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL and other PDF links, indicating the primary goal is to drive traffic to potentially malicious or spam content. No scripts were extracted, but the PDF structure itself facilitates 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.ru/pify?keyword=epidemiologia+veterinaria+michael+thrusfield+pdf+gratis
    • http://files.birchtreegardens.com/uploads/1/3/1/8/131871633/a6adf211d.pdf
    • http://files.riverlureskayaking.com/uploads/1/3/1/4/131437736/8592060.pdf
    • http://files.corezone.online/uploads/1/3/0/7/130776676/sogoximajenewatife.pdf
    • http://files.ameliaseymour.com/uploads/1/3/1/4/131437246/6239298.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/2380/9187/files/coolpad_catalyst_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/voriwatovetizejewadodo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/77330784460.pdf
    • https://cdn.shopify.com/s/files/1/0434/3182/1473/files/75523885865.pdf
    • https://cdn.shopify.com/s/files/1/0438/8116/9051/files/50894098140.pdf
    • https://cdn.shopify.com/s/files/1/0434/1478/2119/files/77982053082.pdf
    • https://cdn.shopify.com/s/files/1/0432/9422/8630/files/sufuparoxexadumuva.pdf
    • https://cdn.shopify.com/s/files/1/0432/9802/9733/files/aneuploidia_y_euploidia.pdf
    • https://cdn.shopify.com/s/files/1/0438/7454/9928/files/96550766791.pdf
    • https://cdn.shopify.com/s/files/1/0431/3019/2039/files/vinona.pdf
    • https://cdn.shopify.com/s/files/1/0427/7947/6134/files/jarujafezeluranegedoze.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_off00008441.bin
1c2b459eefa76d2e46e4915226093510285e2044e6f63992e7a67b98dc9a3299		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8441 5588 bytes
font_01_sfnt_off00009726.bin
7b450613fa3b7eb94302c3ae8835146226b7cbfb8524aa78a7df310f2015d9aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9726 10460 bytes

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