Malicious PDF — malware analysis report

Static analysis result for SHA-256 eef1d16ba819cc94…

MALICIOUS

PDF

52.9 KB Created: 2020-08-17 08:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3908dd7a616644d021eeef483efb8630 SHA-1: caa6634e9e3b3f4d4787b5f9c4948ac74cfdf5ad SHA-256: eef1d16ba819cc94138794d03f4648bfd15b58016d0d2c8d2c154baef987578c
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. The document body, though heavily obfuscated, contains a string that reconstructs to 'https://ttraff.cc/pify?keyword=barangay+certificate+template', indicating a lure for a certificate template. This link points to known malicious infrastructure, suggesting the PDF's primary purpose is to redirect users to a malicious site. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=barangay+certificate+template
    • http://files.coronetclub.org/uploads/1/3/0/7/130775747/75d0c94918d.pdf
    • http://files.nickmancillas.com/uploads/1/3/1/3/131384025/xikodirume.pdf
    • http://tazazi.camarillopoolcleaning.com/uploads/1/3/1/8/131856772/tupaxabekif_kukex_litewax_betim.pdf
    • http://xawewa.motherworkscville.com/uploads/1/3/1/4/131452839/1228f5d.pdf
    • https://cdn.shopify.com/s/files/1/0437/1021/8391/files/raxufutasedibow.pdf
    • https://cdn.shopify.com/s/files/1/0431/6830/1212/files/49617539368.pdf
    • https://cdn.shopify.com/s/files/1/0448/4333/5837/files/orchestration_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/3707/3314/files/jeffrey_archer_best_kept_secret.pdf
    • https://cdn.shopify.com/s/files/1/0431/8052/3678/files/43492379835.pdf
    • https://cdn.shopify.com/s/files/1/0431/0063/5290/files/asymptotic_runtime_complexity.pdf
    • https://cdn.shopify.com/s/files/1/0428/5274/5375/files/74419449406.pdf
    • https://cdn.shopify.com/s/files/1/0437/6156/5850/files/6939611879.pdf
    • https://cdn.shopify.com/s/files/1/0434/4935/2349/files/35457847756.pdf
    • https://cdn.shopify.com/s/files/1/0438/8506/8456/files/genetic_disorders_diseases.pdf
    • https://cdn.shopify.com/s/files/1/0429/3384/6175/files/lord_of_the_ring_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/buxidumex.pdf
    • https://cdn.shopify.com/s/files/1/0433/5783/1336/files/botaru.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008124.bin
b7f317aa0f29cd34df008dc84d8f376d2685882a57a4a5cd0d86477d0adf885a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8124 2828 bytes
font_01_sfnt_off00008b1f.bin
bed1e5449ed31ec84d5d882cc9a02629eedec73c065d73e87cac59acb4a8a8fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B1F 5308 bytes
font_02_sfnt_off00009d1b.bin
7f1028447cce18a563827bef13c74bc0953dfbfd3590fdb7599d76bdd08cf12f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D1B 13060 bytes

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