Malicious PDF — malware analysis report

Static analysis result for SHA-256 f188cf0e5d21b2e2…

MALICIOUS

PDF

74.3 KB Created: 2020-08-07 01:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39718ab701a97b345a05a9b96c06f65e SHA-1: 7f78e1c92faf4b931f885cf062c7e9b2b206ce3d SHA-256: f188cf0e5d21b2e22e5020526b564675a5b8e542af8fbbd5830fbd1e3fc25829
152 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, ttraff.com. The document body, though heavily obfuscated, contains the same URL as a link, suggesting it's intended to trick the user into clicking it. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the malicious nature of the linked infrastructure. The ML classifier also strongly indicated maliciousness.

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=asme+b31.+3+acceptance+criteria+pdf
    • http://files.illuminationhealing.com/uploads/1/3/1/8/131872105/jibedumiwew_vanum.pdf
    • http://files.education-deans.org/uploads/1/3/0/9/130969465/jomakiforegemukero.pdf
    • http://files.relationalintegration.org/uploads/1/3/1/8/131871642/7042929.pdf
    • https://cdn.shopify.com/s/files/1/0433/3237/0584/files/19646335555.pdf
    • https://cdn.shopify.com/s/files/1/0433/7002/1014/files/62335857934.pdf
    • https://cdn.shopify.com/s/files/1/0440/5005/5318/files/82225640571.pdf
    • https://cdn.shopify.com/s/files/1/0428/6365/7119/files/wowonogalezotavivezodala.pdf
    • https://cdn.shopify.com/s/files/1/0433/1231/6584/files/dajafirebolunag.pdf
    • https://cdn.shopify.com/s/files/1/0436/1807/4786/files/2020_calendar_waterproof.pdf
    • https://cdn.shopify.com/s/files/1/0435/3087/9136/files/thematic_apperception_test_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/0162/4214/files/nivaldo_j_tro_chemistry.pdf
    • https://cdn.shopify.com/s/files/1/0437/4223/2725/files/selulopazotimevoxinasi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3577/0532/files/what_is_120_kg_in_pounds.pdf
    • https://cdn.shopify.com/s/files/1/0435/6558/0437/files/10824416036.pdf
    • https://cdn.shopify.com/s/files/1/0436/9163/8934/files/mojatifegapawuferoneronu.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_off0000d466.bin
6ea3ae099a40738d31389cc9ebdd6f6bbb3a9cca415c6e30efae01eb74d78d26		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD466 5324 bytes
font_01_sfnt_off0000e659.bin
ba8da1bb24bca40bb08a1f2b7511fc90f22a5e46798f2ea932e8702e1d25e56a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE659 11872 bytes
font_02_sfnt_off00010dde.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDE 4324 bytes

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