Malicious PDF — malware analysis report

Static analysis result for SHA-256 6651b71020ecc39f…

MALICIOUS

PDF

44.7 KB Created: 2020-08-09 09:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c36ab673f3cd8e752111ed468ae5f1af SHA-1: eafe5619fa8784ef40ebe3b151cca9365df40676 SHA-256: 6651b71020ecc39f858424f8068c0963b0c6c5a2d41697919f4cee0da9f38dae
154 Risk Score

Malware Insights

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

The PDF contains a link to a malicious redirector, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body and embedded links suggest an attempt to create an SEO spam or phishing lure by disguising malicious links as essay PDFs. 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=my+goal+in+life+essay+pdf
    • http://files.shoprainbowsofhealing.com/uploads/1/3/0/8/130813427/cc347.pdf
    • http://jupisetet.chemtutorsg.com/uploads/1/3/1/6/131637814/dezasides.pdf
    • http://files.outsideinstables.com/uploads/1/3/1/4/131406274/8451679.pdf
    • http://files.hopkinsseniorparty.com/uploads/1/3/0/8/130813514/4785117.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/9059/8305/files/91553053331.pdf
    • https://cdn.shopify.com/s/files/1/0435/8524/1256/files/pojabifiki.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9805/files/wujelev.pdf
    • https://cdn.shopify.com/s/files/1/0429/6579/4965/files/drdo_ceptam_chemistry_syllabus_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/8326/0314/files/define_adverb_with_examples.pdf
    • https://cdn.shopify.com/s/files/1/0427/9874/3719/files/62667944295.pdf
    • https://cdn.shopify.com/s/files/1/0428/2908/6876/files/dazepoxomi.pdf
    • https://cdn.shopify.com/s/files/1/0427/9477/8791/files/21903691960.pdf
    • https://cdn.shopify.com/s/files/1/0439/3782/4926/files/definitions_of_language_by_different_linguists.pdf
    • https://cdn.shopify.com/s/files/1/0437/5887/8872/files/bls_provider_manual_2020_free_aha.pdf
    • https://cdn.shopify.com/s/files/1/0441/0349/9928/files/bernarr_macfadden_vitality_supreme.pdf
    • https://cdn.shopify.com/s/files/1/0431/3156/8290/files/jekikelasarogipe.pdf
    • https://cdn.shopify.com/s/files/1/0433/6589/2245/files/xerosevebuvotup.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_off00007086.bin
3644f613cf623f0d49260cf7bc67ffac1cbf390a77b2e78817116c7a8d975ac1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7086 5220 bytes
font_01_sfnt_off0000827e.bin
77c1ccc1fd3c0235b8db04fc64cf18062a2e088120533fab644963095060c802		 pdf-font-stream PDF embedded font (sfnt) at offset 0x827E 10288 bytes

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