Malicious PDF — malware analysis report

Static analysis result for SHA-256 c185c1928dccba8c…

MALICIOUS

PDF

48.1 KB Created: 2020-07-29 22:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f0af59108512ccbc4167f5e3ac8140a SHA-1: 44b0d775538788f96844a8b0b13f27fd6f75848f SHA-256: c185c1928dccba8c0cebc5db4ee60f2d42f074b4cdabf05fb9a2c69981c0e60e
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The primary malicious URL identified is 'https://ttraff.ru/pify?keyword=cadence+allegro+manual+pdf'. The document body, though heavily obfuscated, suggests a lure related to technical manuals, aligning with the malicious redirector's purpose of directing users to potentially harmful content.

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=cadence+allegro+manual+pdf
    • http://files.st-christophers-nh.org/uploads/1/3/0/7/130739712/577f4a52edf.pdf
    • http://files.guardianangelshealing.com/uploads/1/3/1/4/131453421/pexubajoji-delufego.pdf
    • http://files.stemedacademy.com/uploads/1/3/1/6/131637273/wizorumaxidu_begulamibit.pdf
    • http://files.beth-patterson.com/uploads/1/3/1/3/131381095/1224428.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/56803479256.pdf
    • https://cdn.shopify.com/s/files/1/0427/9762/9596/files/ximaxevuwowarajewusures.pdf
    • https://cdn.shopify.com/s/files/1/0430/7307/7415/files/68531972739.pdf
    • https://cdn.shopify.com/s/files/1/0427/7462/6470/files/jumutusa.pdf
    • https://cdn.shopify.com/s/files/1/0429/3135/5807/files/deramo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/punafaga.pdf
    • https://cdn.shopify.com/s/files/1/0431/8799/4792/files/50085042103.pdf
    • https://cdn.shopify.com/s/files/1/0437/8879/6053/files/89827529827.pdf
    • https://cdn.shopify.com/s/files/1/0433/9456/4250/files/31133760141.pdf
    • https://cdn.shopify.com/s/files/1/0437/5432/4117/files/rexugabawivajotilowobasis.pdf
    • https://cdn.shopify.com/s/files/1/0438/9502/9915/files/monofozutajen.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/83171973583.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/
    • https://cdn.shopify.com/s/files/1/0427/7462/6470/f

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007e47.bin
132fee8c944751ce4f61074b43ed601a0418904ec9b5395869083cce7bc696f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E47 5076 bytes
font_01_sfnt_off00008f6d.bin
03e8a63d0582697902eba1156617425027e7e561fd8cd232a529fa3b052f9ba5
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F6D 10792 bytes