Malicious PDF — malware analysis report

Static analysis result for SHA-256 2285a87258ff067e…

MALICIOUS

PDF

46.6 KB Created: 2020-08-04 21:34:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35f9cfcf75ca08706fc32e84791eb4ff SHA-1: 0ad05fa32b0a7b28eacf70e6f7ff06b9a3ab5510 SHA-256: 2285a87258ff067e97ce6d2dae624586b9c013a3adc00a4d3a546495ca9cc635
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/pify?keyword=biophilic+city+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector URL, suggesting the primary intent is to lure the user to this malicious site.

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=biophilic+city+pdf
    • http://files.finksdeli.org/uploads/1/3/2/7/132741222/5b0259.pdf
    • http://files.summerwoodresort.com/uploads/1/3/1/6/131606208/bibidawedag-xipiruve.pdf
    • http://files.veenalothelaw.com/uploads/1/3/1/4/131407552/gekemuji_tumoma_sojot_kemowijux.pdf
    • http://files.wcdupstream.com/uploads/1/3/0/8/130873947/802481.pdf
    • http://files.bound-to-bounce.com/uploads/1/3/1/4/131452883/7b805cc44657031.pdf
    • https://cdn.shopify.com/s/files/1/0429/6340/2905/files/82517143559.pdf
    • https://cdn.shopify.com/s/files/1/0431/3900/6632/files/bufukuxobugisem.pdf
    • https://cdn.shopify.com/s/files/1/0431/7495/3120/files/buvenolez.pdf
    • https://cdn.shopify.com/s/files/1/0432/0336/2973/files/zisogekojofa.pdf
    • https://cdn.shopify.com/s/files/1/0436/9245/8139/files/lilew.pdf
    • https://cdn.shopify.com/s/files/1/0436/8682/2053/files/wefuwubapumox.pdf
    • https://cdn.shopify.com/s/files/1/0433/0242/0644/files/27434565758.pdf
    • https://cdn.shopify.com/s/files/1/0427/4552/8487/files/21249752195.pdf
    • https://cdn.shopify.com/s/files/1/0435/0119/1328/files/current_pst_time.pdf
    • https://cdn.shopify.com/s/files/1/0430/3486/9921/files/75183216875.pdf
    • https://cdn.shopify.com/s/files/1/0432/7142/2102/files/dalabitebumafujobav.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_off00007967.bin
cabdc0834f208ed2229bef4fa75bc4471750442bbc8a9b73d934aca3a8d06fb5
pdf-font-stream PDF embedded font (sfnt) at offset 0x7967 4908 bytes
font_01_sfnt_off00008a2b.bin
1c0d842585a1d5252d7f4e8b4ba90df0e681ca2fccaad34c931ec7ac8372ccf6
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A2B 10288 bytes