Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c0256f8ed782fd…

MALICIOUS

PDF

53.1 KB Created: 2020-08-08 10:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a243c73004fcf7264d562035cc112127 SHA-1: b5eb0a3e0fa05ddc44cc6346421d34d8d09be73c SHA-256: a1c0256f8ed782fda2e690861dfc9b40f3891b5575a6d32287b2962280c93268
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to SEO-optimized PDF files hosted on platforms like Shopify, which is characteristic of link farm abuse. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is used to obscure the final destination. The document body, though partially corrupted, contains the phrase 'Operation research assignment problem pdf' and the malicious URL, suggesting a lure to trick users into clicking malicious links under the guise of academic content.

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=operation+research+assignment+problem+pdf
    • http://files.antoinegindt.com/uploads/1/3/0/8/130814298/6571663.pdf
    • http://kuzoxed.suite-harmony.com/uploads/1/3/2/7/132740873/d1421.pdf
    • http://files.egyptkora.com/uploads/1/3/2/6/132683292/pegosufefudovo-matometuvozob-zimonivow.pdf
    • http://wowepapa.bentonareaedc.com/uploads/1/3/0/9/130969744/rezakipazekuf.pdf
    • http://files.littlefieldgallery.com/uploads/1/3/0/8/130813906/efe1fe75fec.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gojifazuxosupimuron.pdf
    • https://cdn.shopify.com/s/files/1/0434/2562/8327/files/noto_sans_symbols_error.pdf
    • https://cdn.shopify.com/s/files/1/0438/6881/5528/files/sports_cars_under_10k.pdf
    • https://cdn.shopify.com/s/files/1/0434/2225/3208/files/burhan_bungin_metodologi_penelitian_kualitatif.pdf
    • https://cdn.shopify.com/s/files/1/0433/7831/1326/files/90707247684.pdf
    • https://cdn.shopify.com/s/files/1/0432/1063/7476/files/68137953791.pdf
    • https://cdn.shopify.com/s/files/1/0436/2990/4032/files/blueprint_book_nicholas_christakis_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/8098/1403/files/coordinate_plane_template.pdf
    • https://cdn.shopify.com/s/files/1/0430/4614/2114/files/google_photos_screensaver.pdf
    • https://cdn.shopify.com/s/files/1/0436/8619/9461/files/tower_bioreactor.pdf
    • https://cdn.shopify.com/s/files/1/0431/5129/4619/files/beropeditanoj.pdf
    • https://cdn.shopify.com/s/files/1/0435/6630/1343/files/maplestory_reboot_equipment_guide_2017.pdf
    • https://cdn.shopify.com/s/files/1/0428/3046/3142/files/35640224060.pdf
    • https://cdn.shopify.com/s/files/1/0428/8184/3356/files/gojum.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_off0000784c.bin
7e4bd5d87ab9f47c8ec6c0a46886f98d288bc01920d2871094b589b10b2d6098		 pdf-font-stream PDF embedded font (sfnt) at offset 0x784C 5736 bytes
font_01_sfnt_off00008b98.bin
cb2c703c2bc66d5036a4bcc0eab5f7887d448c25be40695b917d29d9d1ade438		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B98 11048 bytes
font_02_sfnt_off0000b119.bin
d88af38a891ef15f1f1fa70a62d8dfb949a6dcf1fef855cd0b760e7b5176232e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB119 16256 bytes

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