Malicious PDF — malware analysis report

Static analysis result for SHA-256 8374ff0a0e0c0a31…

MALICIOUS

PDF

42.3 KB Created: 2020-08-08 01:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30b8e54a082609dd3fd602c18c6f4515 SHA-1: 76dcde928babf282251a21b319d7e35dda7642aa SHA-256: 8374ff0a0e0c0a3148adef147e3e06488c6a6c3cd77b7a438d4befd7ff003d2c
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm hosted on Shopify, but one critical link redirects to known malicious infrastructure via ttraff.com. The document body, though partially corrupted, contains text related to academic resources, suggesting a lure to trick users into clicking the malicious link. The ML classifier 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.com/pify?keyword=diagnostic+teaching+of+reading+techniques+for+instruction+and+assessment+pdf
    • http://tatukupal.matsusokankarate.org/uploads/1/3/0/7/130776791/laredazanuvuje_zezelamovemu_mopujalojoke.pdf
    • http://files.kerriereading.com/uploads/1/3/2/6/132681488/dikomokalolama-jujud-zigavevidej.pdf
    • http://files.mwilkinson91.com/uploads/1/3/2/6/132695569/wosotiv.pdf
    • http://files.trexopt.com/uploads/1/3/1/3/131380849/94956808c3dd.pdf
    • https://cdn.shopify.com/s/files/1/0440/6365/4040/files/functional_skills_maths_level_2_revision.pdf
    • https://cdn.shopify.com/s/files/1/0440/5769/0262/files/79465780503.pdf
    • https://cdn.shopify.com/s/files/1/0429/9436/8663/files/4147900587.pdf
    • https://cdn.shopify.com/s/files/1/0438/6694/7744/files/fundamentals_of_seismic_wave_propagation.pdf
    • https://cdn.shopify.com/s/files/1/0436/9675/0746/files/95629997841.pdf
    • https://cdn.shopify.com/s/files/1/0428/1679/8883/files/sql_injection_attacks_and_defense_second_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/73930450062.pdf
    • https://cdn.shopify.com/s/files/1/0436/2692/2146/files/office_mac_crack.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bivunamu.pdf
    • https://cdn.shopify.com/s/files/1/0440/0427/8422/files/rafilagirafesojefu.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_off000064c7.bin
b79a48b3e7388f0f4677fa43226a6806ce675a8d761e3c7a7a1e46cc5f23e4b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x64C7 5660 bytes
font_01_sfnt_off000077e6.bin
65fa46c0e13eb43d819547ea2cb98c1dad41298971291685d40a29d73af38d90
pdf-font-stream PDF embedded font (sfnt) at offset 0x77E6 10468 bytes