Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f1a9a4b040fceb…

MALICIOUS

PDF

40.1 KB Created: 2020-08-13 11:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a3f0fc7a564fbffc65804de6589bf94 SHA-1: 97d685927d06874797f524806ea8aacf338e3064 SHA-256: 15f1a9a4b040fceb1a9562a2d7fcaed3c1f1d80eb685f8012023387325680635
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a tactic to manipulate search engine results or distribute malicious content. The presence of a LOLBin token sequence further supports malicious intent, potentially related to command execution or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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/wb?keyword=aceptacion%20radical%20pdf%20gratis
    • http://files.charmcitycrusaders.com/uploads/1/3/1/3/131383426/korotato-zasuvirab-worupiwaba-mozumav.pdf
    • http://files.jacquelinedoyle.com/uploads/1/3/0/7/130776416/1507261748b.pdf
    • http://navaguzi.q-four.com/uploads/1/3/0/7/130776260/daxiruwezuwafu_felepa_vuxegoludo.pdf
    • http://files.ps165qcomputerlab.com/uploads/1/3/1/4/131453406/8145602.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/0623/7604/files/96783446919.pdf
    • https://cdn.shopify.com/s/files/1/0430/5630/0186/files/curl_post_command.pdf
    • https://cdn.shopify.com/s/files/1/0436/0686/8126/files/egg_biryani_recipe_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0435/1423/2996/files/vuduwaxebenisulid.pdf
    • https://cdn.shopify.com/s/files/1/0431/7508/4193/files/xopamat.pdf
    • https://cdn.shopify.com/s/files/1/0434/1039/1207/files/wikaziwe.pdf
    • https://cdn.shopify.com/s/files/1/0432/8154/7428/files/cbse_class_12_syllabus_2020_18.pdf
    • https://cdn.shopify.com/s/files/1/0430/2526/8889/files/chief_keef_tony_hawk_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/1576/6177/files/tefasilalakatikuxedoxadib.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4885/files/definicion_de_amigos.pdf
    • https://cdn.shopify.com/s/files/1/0433/8571/6886/files/divina_commedia_paradiso.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/
    • https://cdn.shopify.com/s/files/1/0436
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c31.bin
742e2aafaa93c0feaab474d94c9e10e3be6196adc2f2ca7f0c02a2d64394bca5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C31 5312 bytes
font_01_sfnt_off00006e42.bin
1c381149bde84338f5fd7304a10c2c1fe8e3026a5e3b159127cab41e6e672fbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E42 11044 bytes

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