Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b40894193ebac2…

MALICIOUS

PDF

38.7 KB Created: 2020-08-11 08:29:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4455d6d64071bbd42eac72139539ae5 SHA-1: 30347fea547bbc1b21ec812fbb910e2f90e8531f SHA-256: f1b40894193ebac2148e914848dba5463be0ee95b12a24527a5294ec5df3af20
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one critical link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=american+english+file+starter+b+pdf', suggesting a lure to a malicious site. The presence of numerous Shopify-hosted PDF links indicates an attempt to create a large, seemingly legitimate, link farm to mask malicious activity. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=american+english+file+starter+b+pdf
    • http://files.priscillawakefield.uk/uploads/1/3/0/8/130814510/1fa4a2.pdf
    • http://files.drlaurienavinllc.com/uploads/1/3/1/4/131453255/bfb8a4ae.pdf
    • http://magimi.acsksolicitors.com/uploads/1/3/0/7/130738964/5144807.pdf
    • http://files.zanegerringer.com/uploads/1/3/0/7/130775336/7475165.pdf
    • https://cdn.shopify.com/s/files/1/0432/7692/7141/files/attitudes_personality_and_behaviour.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dijovosulodomozov.pdf
    • https://cdn.shopify.com/s/files/1/0434/2765/9932/files/effect_of_water_pollution_on_human_life.pdf
    • https://cdn.shopify.com/s/files/1/0431/0165/1105/files/773_951_7670.pdf
    • https://cdn.shopify.com/s/files/1/0433/5943/6968/files/sudazarezepux.pdf
    • https://cdn.shopify.com/s/files/1/0431/7354/4093/files/lunezibaf.pdf
    • https://cdn.shopify.com/s/files/1/0429/5114/7676/files/99614828282.pdf
    • https://cdn.shopify.com/s/files/1/0435/4405/1864/files/61451791552.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/83300066175.pdf
    • https://cdn.shopify.com/s/files/1/0431/5647/1970/files/how_to_install_a_texture_pack.pdf
    • https://cdn.shopify.com/s/files/1/0432/8918/2376/files/12676361907.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_off000058d5.bin
4bd12e7a40b74969fabfebfcc9a2d56b176c826cba65635da07dfbcd94f38bf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58D5 5700 bytes
font_01_sfnt_off00006bf4.bin
36f3f771eccaece11a4ddf899998e0b0aa969b2e95dbe282ed2063d68fcd9692		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF4 10072 bytes

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