Malicious PDF — malware analysis report

Static analysis result for SHA-256 66eacf2b4cb01109…

MALICIOUS

PDF

42.2 KB Created: 2020-08-23 10:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b469c652e77969d4ddaa5bfc457e3246 SHA-1: 7c84fe63ee0aeeb646540588a42f99c8111e3b53 SHA-256: 66eacf2b4cb01109883f2ec32ffdeba8e327af5182575832b5c5143b789fddd8
194 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific URL disguised as a password cracker, which redirects to malicious infrastructure. The document body, though heavily obfuscated, contains the malicious URL and references to password cracking, suggesting a lure to download further malware. The presence of numerous embedded links and the ML classifier's high confidence indicate a malicious intent to redirect users to potentially harmful content.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=brutus+aet2+password+cracker+free
    • http://files.taaonline.org/uploads/1/3/1/4/131438778/robivowaximoxoj_rakik_logebedex.pdf
    • http://files.chelseagsps.com/uploads/1/3/2/6/132683165/razubagorep.pdf
    • http://ninejupo.clarysageconsulting.com/uploads/1/3/1/4/131454165/zajarulasenugonona.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8555/3061/files/belonop.pdf
    • https://cdn.shopify.com/s/files/1/0437/7296/9109/files/balapu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6533/4165/files/7310588020.pdf
    • https://cdn.shopify.com/s/files/1/0429/2427/7923/files/united_state_address.pdf
    • https://cdn.shopify.com/s/files/1/0436/9963/4330/files/clavier_qwerty_en_azerty_sous_android.pdf
    • https://cdn.shopify.com/s/files/1/0440/6411/2805/files/58158556283.pdf
    • https://cdn.shopify.com/s/files/1/0430/0364/2007/files/67249737641.pdf
    • https://cdn.shopify.com/s/files/1/0429/6956/3290/files/lozupexuvokekalemipadore.pdf
    • https://cdn.shopify.com/s/files/1/0435/2563/6248/files/43019266456.pdf
    • https://cdn.shopify.com/s/files/1/0440/5864/0549/files/biodata_form_philippines.pdf
    • https://cdn.shopify.com/s/files/1/0437/7716/3426/files/92937012111.pdf
    • https://cdn.shopify.com/s/files/1/0433/9453/1493/files/discord_delete_dm_history.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_off0000672d.bin
290774a9223cb2fd813243a3bab5124f1fb4b1fe6c1c4490a316d98272b6b9d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x672D 5456 bytes
font_01_sfnt_off000079e7.bin
3010953ad22909bfc7e2c8ae03bbe7182471a9b90875f106e46bef2580d14956		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79E7 10008 bytes

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