Malicious PDF — malware analysis report

Static analysis result for SHA-256 c12196606ee7f0e5…

MALICIOUS

PDF

35.6 KB Created: 2020-08-21 17:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca48d15807a53a9299f45e4a9dcb5c03 SHA-1: 255a3598ccf1db572377628ea677dede2806c6e3 SHA-256: c12196606ee7f0e579d5c85ed057667c8182c3fcb07b2853f39784cc709b3792
152 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, with one pointing to a known malicious redirector. The document body itself is heavily obfuscated but contains references to the malicious URL and numerous other PDF files hosted on shopify.com, suggesting a link farm or SEO manipulation tactic. 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.ru/pify?keyword=calvin+klein+high+top+platform+sneakers
    • http://files.blackjacksautobody.com/uploads/1/3/0/7/130739697/vugifoteluwiwi-juvofelusude-nipuxofidugaxi.pdf
    • http://suzej.cisdbooksandbytes.org/uploads/1/3/1/3/131383613/8289789.pdf
    • http://gozunuku.tararuff.com/uploads/1/3/0/7/130776031/5805512.pdf
    • http://files.clbmg.com/uploads/1/3/2/8/132815807/5996800.pdf
    • https://cdn.shopify.com/s/files/1/0438/2107/2546/files/equilibrio_termico_ejercicios_resueltos.pdf
    • https://cdn.shopify.com/s/files/1/0430/1471/7597/files/change_text_color_discord.pdf
    • https://cdn.shopify.com/s/files/1/0449/8640/0936/files/alfred_marshall_libros.pdf
    • https://cdn.shopify.com/s/files/1/0432/5238/3902/files/fodowabapitiwigef.pdf
    • https://cdn.shopify.com/s/files/1/0436/0113/3731/files/delanonolodutelenegita.pdf
    • https://cdn.shopify.com/s/files/1/0435/1868/9432/files/rita_mulcahy.pdf
    • https://cdn.shopify.com/s/files/1/0437/1536/2984/files/broken_blade_of_heroes_vanilla.pdf
    • https://cdn.shopify.com/s/files/1/0429/6772/8279/files/kidiw.pdf
    • https://cdn.shopify.com/s/files/1/0428/8974/0441/files/dukaroxedebunuxof.pdf
    • https://cdn.shopify.com/s/files/1/0431/1131/7658/files/tasawuf_imam_al_ghazali.pdf
    • https://cdn.shopify.com/s/files/1/0433/3345/1944/files/raxagaku.pdf
    • https://cdn.shopify.com/s/files/1/0430/2631/7473/files/60579819463.pdf
    • https://cdn.shopify.com/s/files/1/0454/6340/4694/files/34964071526.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_off000043da.bin
4054993e60306a5ea9d2dd3d0428f14db15c9c4d6f9d2592a999983f2527419f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x43DA 5248 bytes
font_01_sfnt_off00005594.bin
f4df25eb3072c5dfe01fe84477ea70c93d20bda01134804ef051831ab370f16e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5594 8952 bytes
font_02_sfnt_off000073d3.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73D3 4324 bytes

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