Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a8fac4f13d9d07…

MALICIOUS

PDF

41.0 KB Created: 2020-08-01 17:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a5d8a0cb4c15a59fa386f0c0303c7bc SHA-1: c13183b5f95284c6f56133df482892f2c3a85aef SHA-256: 35a8fac4f13d9d07608b21c1b113371c29f92955827d8fe69bdea2f58e4faed2
152 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, with one critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains text referencing 'Kubota parts manual pdf' and includes the malicious URL. The primary attack pattern involves luring the user to click the malicious link, which then redirects to further malicious infrastructure.

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=kubota+parts+manual+pdf
    • http://files.roundtuitkitchen.com/uploads/1/3/0/9/130969656/nunejebowagipux-fepenu-rimefofepamifa-rivimewus.pdf
    • http://files.liezlwatermeyer-collinsartist.com/uploads/1/3/0/8/130814346/nefofag.pdf
    • http://files.citycentrechurch.ca/uploads/1/3/1/3/131379706/deveto.pdf
    • https://cdn.shopify.com/s/files/1/0438/1055/4016/files/windows_xp_sounds_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/3779/4204/files/acs_general_chemistry_exam.pdf
    • https://cdn.shopify.com/s/files/1/0437/5419/3047/files/76623524001.pdf
    • https://cdn.shopify.com/s/files/1/0438/7287/8747/files/61703837958.pdf
    • https://cdn.shopify.com/s/files/1/0430/0118/4417/files/11299603583.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/datufezon.pdf
    • https://cdn.shopify.com/s/files/1/0430/8910/0951/files/jamebabo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mozesuseb.pdf
    • https://cdn.shopify.com/s/files/1/0440/8590/3525/files/bonhoeffer_life_together_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/5901/9927/files/4702891414.pdf
    • https://cdn.shopify.com/s/files/1/0433/5170/3706/files/zitem.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_off00005a6a.bin
b2d36fece6cf1560a1980aa64a10a5cf2b528babcd8f54ddeb23c39efca59a2e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A6A 5296 bytes
font_01_sfnt_off00006c55.bin
31ef56280b4d334c0a159955c1c8f97c83e1066bd5239c5d168051c7114686d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C55 13676 bytes