Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a57e4ef32a08a71…

MALICIOUS

PDF

68.8 KB Created: 2020-08-09 05:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7c0cf4c594c02e8efbfd80f81e265ba SHA-1: da0a1a8a1c6eb50661fc4e3514269d307ce0cb3d SHA-256: 7a57e4ef32a08a71c37617ced2a07318fa1f452c072bad9a5ec5661e9c5b7b50
162 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a user guide. The presence of a malicious redirector and a link farm suggests an attempt to drive traffic to malicious sites, likely for phishing or malware distribution.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.cc/pify?keyword=i2+analyst+notebook+9+user+guide+pdf
    • http://files.kashmirgoldens.com/uploads/1/3/1/4/131407067/xokakemamora_raberazakuwigif_duluwinumaxe_fipane.pdf
    • http://files.yuocreations.com/uploads/1/3/2/7/132741241/balulegojowumarawo.pdf
    • http://files.stephenmazujian.com/uploads/1/3/1/0/131070597/pomogexiset.pdf
    • http://files.northernsmokers.com/uploads/1/3/1/4/131437464/sodom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1532/3291/files/wuvalupakomobiwa.pdf
    • https://cdn.shopify.com/s/files/1/0431/5676/6882/files/wubamurinowiri.pdf
    • https://cdn.shopify.com/s/files/1/0433/2149/1621/files/jopokepufu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7885/2507/files/asynchronous_generator.pdf
    • https://cdn.shopify.com/s/files/1/0432/5831/4912/files/midadekefabuwekiwelukufus.pdf
    • https://cdn.shopify.com/s/files/1/0433/7732/8278/files/negul.pdf
    • https://cdn.shopify.com/s/files/1/0437/5396/3678/files/consenso_asma_pediatria.pdf
    • https://cdn.shopify.com/s/files/1/0431/2409/7191/files/voicemail_notification_won_t_go_away.pdf
    • https://cdn.shopify.com/s/files/1/0435/5201/4495/files/basic_tactics_for_listening_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/1241/5907/files/mabegesokepifije.pdf
    • https://cdn.shopify.com/s/files/1/0430/8349/7623/files/24621527585.pdf
    • https://cdn.shopify.com/s/files/1/0428/8613/5961/files/difference_between_atomic_mass_and_atomic_weight.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_off0000cd36.bin
756ec8f7ac1d5c8ac52d09e23e9a814ae0a4ebd3bf625c763b3fc5de1835e214		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD36 5740 bytes
font_01_sfnt_off0000e0d6.bin
d4b3c3c583cdc61adadfc4730df18ad6c96646fcad9adc878bd974fb8f54ee29		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D6 11408 bytes

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