Malicious PDF — malware analysis report

Static analysis result for SHA-256 19c25448ec93de1d…

MALICIOUS

PDF

39.4 KB Created: 2020-08-12 12:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5e011eef6222aff2ee86ada6878f1b0 SHA-1: 113b9352a7f6e0f0fdd46ce56305aa5c59ffca07 SHA-256: 19c25448ec93de1db192e5abf7c340b5d6672769835367b4efe20345e420dc6c
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with numerous external links, many pointing to Shopify-hosted PDFs. The primary malicious URL identified is https://ttraff.cc/pify?keyword=el+moasser+chemistry+2nd+secondary+pdf, which likely serves as a gateway to further malicious content. The document body, though heavily obfuscated, contains references to the same URLs, reinforcing the malicious intent.

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=el+moasser+chemistry+2nd+secondary+pdf
    • http://files.hayzohealthcare.com/uploads/1/3/1/8/131856039/kudukoveja-masirof.pdf
    • http://files.skyhighkennels.com/uploads/1/3/0/9/130969710/5c87cb4.pdf
    • http://files.honorthewarriors.org/uploads/1/3/0/9/130969522/wimulanuzosirum.pdf
    • http://saliza.kocanada-usa.com/uploads/1/3/1/4/131409090/910159.pdf
    • http://josujif.myjourneytoadventure.com/uploads/1/3/1/8/131856935/b69e1640.pdf
    • https://cdn.shopify.com/s/files/1/0436/0011/7928/files/60118841484.pdf
    • https://cdn.shopify.com/s/files/1/0436/6221/3270/files/epilepsy_types.pdf
    • https://cdn.shopify.com/s/files/1/0427/9762/9596/files/8366179977.pdf
    • https://cdn.shopify.com/s/files/1/0431/3799/0813/files/balboa_theater_seating_chart.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53446206952.pdf
    • https://cdn.shopify.com/s/files/1/0447/9506/8565/files/principles_of_banking_and_finance_notes.pdf
    • https://cdn.shopify.com/s/files/1/0429/0406/0071/files/abomasal_displacement_in_cattle.pdf
    • https://cdn.shopify.com/s/files/1/0430/4932/0610/files/83360411812.pdf
    • https://cdn.shopify.com/s/files/1/0430/1645/4305/files/francis_francis_x1.pdf
    • https://cdn.shopify.com/s/files/1/0440/4301/0198/files/68580489990.pdf
    • https://cdn.shopify.com/s/files/1/0433/4593/6534/files/wilivam.pdf
    • https://cdn.shopify.com/s/files/1/0438/0835/8561/files/garmin_edge_1000_manual.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_off00005026.bin
94c17607e6f53f1673fa32de4b263417d19ca280a4d4f9ad83234f1f88d8123d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5026 5376 bytes
font_01_sfnt_off00006247.bin
a73875af8e14ab8b8bc7bf45ea6b42a73c5110d48c568b3d50b54b571711476a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6247 9360 bytes
font_02_sfnt_off0000825e.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x825E 4324 bytes

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