Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e9738f72cb715a…

MALICIOUS

PDF

50.5 KB Created: 2020-07-28 07:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f41329abbeac884d9934d50a7f6e3494 SHA-1: 5c6ed33cc22b669136acb75dfbfb40426528346e SHA-256: 41e9738f72cb715a0e9f446500b27a8144acd95d18d82b44e1e2d94140851e6a
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, suggests a lure related to web development templates. The presence of a link farm and a high ML classifier score further indicate malicious intent, likely for phishing or malware distribution.

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=template+html+css+bootstrap
    • http://files.libertymerchandise.org/uploads/1/3/0/7/130776511/ganejotaxijuzadem.pdf
    • http://files.oiim.net/uploads/1/3/2/6/132680986/sojuva.pdf
    • http://files.swarthmorehorticulturalsociety.org/uploads/1/3/1/4/131438038/tobalusib_minakotow_viwofeniwute.pdf
    • http://files.burlinistudio.com/uploads/1/3/2/7/132740787/lominekoreda.pdf
    • http://files.rehobothconcertband.org/uploads/1/3/0/9/130969825/7040228.pdf
    • https://cdn.shopify.com/s/files/1/0434/7396/1125/files/mududovedepagi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4916/4693/files/fudaberinuk.pdf
    • https://cdn.shopify.com/s/files/1/0431/6410/6901/files/6719930239.pdf
    • https://cdn.shopify.com/s/files/1/0435/2868/3674/files/99330583260.pdf
    • https://cdn.shopify.com/s/files/1/0429/8499/7025/files/padipibajikaxujeviravarew.pdf
    • https://cdn.shopify.com/s/files/1/0431/3884/2779/files/18355102616.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rinavupomun.pdf
    • https://cdn.shopify.com/s/files/1/0429/8542/2997/files/42579239911.pdf
    • https://cdn.shopify.com/s/files/1/0439/5103/0430/files/8632293819.pdf
    • https://cdn.shopify.com/s/files/1/0429/7529/7689/files/giwekokexipu.pdf
    • https://cdn.shopify.com/s/files/1/0434/9421/1750/files/48569323394.pdf
    • https://cdn.shopify.com/s/files/1/0428/1729/0406/files/gezurifaf.pdf
    • https://cdn.shopify.com/s/files/1/0427/7141/5196/files/59382065437.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_off0000887b.bin
f8541661a0da3fd459bc1a441dc39d9cfe956061c3db2e6d14b160e1c94fe0b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x887B 4896 bytes
font_01_sfnt_off0000990f.bin
b538790fd00fc79d4a3284831af6e7439f2ba6d82289c4aebfafdba2d1741b30
pdf-font-stream PDF embedded font (sfnt) at offset 0x990F 10360 bytes