Malicious PDF — malware analysis report

Static analysis result for SHA-256 6369352aac0b2bc4…

MALICIOUS

PDF

42.9 KB Created: 2020-08-18 15:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73195d4fcf26a471bedd76144e1eb478 SHA-1: 3ea015c6fa5a80912e00965be2961620e48759d6 SHA-256: 6369352aac0b2bc4665dd4778307463e6630c5a1de10352e9780347aae2d2d25
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and SEO poisoning tactics. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'ttraff.cc'. The document body, though partially corrupted, contains text related to 'ios icon sizes cheat sheet', suggesting a lure to attract clicks.

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=ios+icon+sizes+cheat+sheet
    • http://files.aiwonglawyers-en.com/uploads/1/3/0/7/130775033/runowe.pdf
    • http://files.josemleyva.com/uploads/1/3/0/7/130775786/pobobifepit.pdf
    • http://files.codycordova.com/uploads/1/3/1/3/131398025/zivoxarinobiwizilofa.pdf
    • http://files.hyesookchoi.com/uploads/1/3/1/4/131454620/tizenuzimo-metisagufofa-wedizatiwola-sixokuvotasifo.pdf
    • http://files.hydrogeosediment.org/uploads/1/3/0/7/130739826/401220d276.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/2222/8379/files/chromophore_and_auxochrome_theory.pdf
    • https://cdn.shopify.com/s/files/1/0430/2100/9053/files/duxelenafofudevoxisa.pdf
    • https://cdn.shopify.com/s/files/1/0431/4890/2560/files/igcse_additional_mathematics_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0431/8163/7794/files/9660688763.pdf
    • https://cdn.shopify.com/s/files/1/0447/9621/5456/files/holt_environmental_science_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0431/6086/2874/files/hemoglobin_buffer_system.pdf
    • https://cdn.shopify.com/s/files/1/0436/2190/8640/files/gepotako.pdf
    • https://cdn.shopify.com/s/files/1/0438/4935/1328/files/bach_air_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0433/2643/9582/files/8965156765.pdf
    • https://cdn.shopify.com/s/files/1/0437/5147/3303/files/90885874291.pdf
    • https://cdn.shopify.com/s/files/1/0433/7431/3633/files/gourmet_race_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0428/5172/9567/files/15396470857.pdf
    • https://cdn.shopify.com/s/files/1/0432/4986/0765/files/sewamodonel.pdf
    • https://cdn.shopify.com/s/files/1/0430/6170/6903/files/property_and_casualty_insurance_license_exam.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000653f.bin
8b45a404780545f258970c82f00b4cef2f1af2d9ad2bbe7c6689c9e83ffc3eb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x653F 4744 bytes
font_01_sfnt_off0000755b.bin
712e10c89c818baecac8fad81d577239675be4f3a11ada19172e473d4500fa5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x755B 13184 bytes

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