Malicious PDF — malware analysis report

Static analysis result for SHA-256 7435cc38b90198f3…

MALICIOUS

PDF

37.9 KB Created: 2020-08-25 05:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6678560d912fa032799a22b08f2e10e9 SHA-1: 818e8beb8cdba77ad64170bce84f9af510e4d99a SHA-256: 7435cc38b90198f36cf78b7c6cf3e78c5d6e0f46a9d2801ea3130392920b0ba8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The ML classifier also strongly indicated maliciousness. The primary malicious URL identified is https://ttraff.cc/pify?keyword=yoshimitsu+guide+sc6, which likely serves as a lure to further malicious content.

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=yoshimitsu+guide+sc6
    • http://files.theredroomproject.com/uploads/1/3/0/7/130775838/5136375.pdf
    • http://xegop.thepostnatalproject.com/uploads/1/3/1/4/131437850/jumatavolozedamame.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6597/4690/files/solving_and_graphing_linear_inequalities_worksheet_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0435/7573/8527/files/7742370802.pdf
    • https://cdn.shopify.com/s/files/1/0434/6576/9113/files/amtrak_adirondack_schedule.pdf
    • https://cdn.shopify.com/s/files/1/0430/4509/3533/files/10716635733.pdf
    • https://cdn.shopify.com/s/files/1/0434/4738/6268/files/89825015507.pdf
    • https://cdn.shopify.com/s/files/1/0430/9306/5877/files/formica_sheets_wood_grain.pdf
    • https://cdn.shopify.com/s/files/1/0428/9386/9223/files/battlegrounds_battle_buddy_apk.pdf
    • https://cdn.shopify.com/s/files/1/0436/2059/7923/files/wukojeforidipazaxovosej.pdf
    • https://cdn.shopify.com/s/files/1/0433/0828/6105/files/bugler_s_holiday.pdf
    • https://cdn.shopify.com/s/files/1/0431/3785/9735/files/enlight_renewable_energy_ltd_annual_report.pdf
    • https://cdn.shopify.com/s/files/1/0430/6062/5562/files/87100948932.pdf
    • https://cdn.shopify.com/s/files/1/0427/9504/0924/files/characterization_of_gold_nanoparticles.pdf
    • https://cdn.shopify.com/s/files/1/0432/4599/4146/files/40916369866.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_off000057eb.bin
c60488832ab22bfdc9424f6fde42bade4f0449ced5573dc1092db67314320b79
pdf-font-stream PDF embedded font (sfnt) at offset 0x57EB 5128 bytes
font_01_sfnt_off0000693f.bin
a791357cdaa1fa996836a3c248101a97c2543eac0d301b146fdd83d2ddf50d25
pdf-font-stream PDF embedded font (sfnt) at offset 0x693F 9936 bytes