Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb0d50e66aef526…

MALICIOUS

PDF

122.7 KB Created: 2020-08-05 17:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30ffeb8eeb40364de492dc89751a60e6 SHA-1: 2c6c2dcadf7f17e01692748798dbbefe5236d38c SHA-256: ffb0d50e66aef526a20155cacdbbfd64c02ffe3a28f24dd2d9707d745d316765
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to its inclusion of a link to a known malicious redirector infrastructure. It also contains a large number of external PDF links, characteristic of a link farm. The primary malicious URL identified is https://ttraff.ru/pify?keyword=asmaul+husna+dan+artinya+bahasa+indonesia+pdf, which is likely used to funnel users to further malicious content. The document body itself is heavily obfuscated and contains what appears to be a reconstructed URL, but it is too corrupted to be reliably extracted.

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=asmaul+husna+dan+artinya+bahasa+indonesia+pdf
    • http://files.pottingwithpotter.com/uploads/1/3/1/4/131453329/8e7c635.pdf
    • http://files.americanimmigrationpllc.com/uploads/1/3/0/9/130969461/vezawep.pdf
    • http://files.silk-motorcycles.org/uploads/1/3/1/3/131379277/jurikaf.pdf
    • http://files.sjbmusic.org/uploads/1/3/1/0/131070362/wokozofelawu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3165/7638/files/rifoxoguxemokubenisavapa.pdf
    • https://cdn.shopify.com/s/files/1/0430/9411/4455/files/best_app_to_annotate_on_ipad.pdf
    • https://cdn.shopify.com/s/files/1/0435/7062/6723/files/piwabobewekozuji.pdf
    • https://cdn.shopify.com/s/files/1/0436/9963/4328/files/vusemu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6287/8618/files/68452716489.pdf
    • https://cdn.shopify.com/s/files/1/0432/3196/9438/files/60185574530.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/2362165861.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/22909447013.pdf
    • https://cdn.shopify.com/s/files/1/0434/8618/3577/files/opposite_words_in_english_file.pdf
    • https://cdn.shopify.com/s/files/1/0430/2848/0157/files/tifojosokumetuvumuruni.pdf
    • https://cdn.shopify.com/s/files/1/0434/0921/1557/files/64900051695.pdf
    • https://cdn.shopify.com/s/files/1/0433/3905/5253/files/42432983080.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0001984e.bin
2f05c95d30bf9a7af56573b18b3a9a371e578fb84082302c850c4c05a15e8998		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1984E 29380 bytes
font_00_sfnt_off00015901.bin
f740bba49be649973c6b7cbab4f8afc7bf1acd20940e7ddbf2e00007e4654946		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15901 5396 bytes
font_01_sfnt_off00016b25.bin
a2a538af8b1db0df15d06dcbcaaa2dadef915a7db97fe101d8ec3ea87b1742e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16B25 14588 bytes
font_03_sfnt_off0001cc5f.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC5F 4324 bytes

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