Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f2336413387abdf…

MALICIOUS

PDF

37.3 KB Created: 2020-08-09 10:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d265be4e89ff0d5f3d4f1515d2b0bd9 SHA-1: 636a4fffa330b3b395386aa8e28eb1a2744e6df3 SHA-256: 6f2336413387abdf0b9e85de928ff5a048d32d21b67d57befb390231c128fef5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also contains a large number of embedded URLs, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. No scripts were extracted, but the presence of numerous links points to a content-based lure.

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.ru/pify?keyword=ambrosia+magazine+pdf
    • http://files.rosawainartist.com/uploads/1/3/0/7/130739654/4621f92eaf.pdf
    • http://diromofig.theartoftheheart-chester.com/uploads/1/3/0/7/130775432/5900919.pdf
    • http://files.gocmovies.com/uploads/1/3/1/4/131453695/junita_rapos_wunisifawur_tupodukuwomit.pdf
    • http://files.bajananda.com/uploads/1/3/1/4/131453715/jufatorori.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/0402/5242/files/ucmj_article_134_adultery.pdf
    • https://cdn.shopify.com/s/files/1/0437/8414/3010/files/fake_gps_location_spoofer_v4._6_apk.pdf
    • https://cdn.shopify.com/s/files/1/0436/0850/6531/files/migizefu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9085/3531/files/58939794944.pdf
    • https://cdn.shopify.com/s/files/1/0430/7451/9194/files/postnatal_assessment_format.pdf
    • https://cdn.shopify.com/s/files/1/0432/5274/4356/files/cancer_de_colon_derecho_e_izquierdo.pdf
    • https://cdn.shopify.com/s/files/1/0439/9936/3222/files/brand_guide_examples.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/72438278193.pdf
    • https://cdn.shopify.com/s/files/1/0434/3064/1826/files/length_unit_conversion_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0497/6548/files/bipamabodomireduno.pdf
    • https://cdn.shopify.com/s/files/1/0429/9236/9823/files/84552936795.pdf
    • https://cdn.shopify.com/s/files/1/0430/4610/9345/files/24561298086.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/81858120772.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_off0000541f.bin
75cd0b82a35f6ed43451bd91e57f29809c05b1935b1a3e19fdddc2c0aced48cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x541F 5508 bytes
font_01_sfnt_off000066c0.bin
ccd0ce28369f4e6a49694a4769d9da41f59278c1e2f36f7e15b36465d26e9922		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66C0 9864 bytes

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