Malicious PDF — malware analysis report

Static analysis result for SHA-256 06118ecd8db9f486…

MALICIOUS

PDF

41.4 KB Created: 2020-08-14 00:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0158780739be679497f817afd17c406f SHA-1: 7ad799bd13f1713ed2161ce7f0a226b556fef0e1 SHA-256: 06118ecd8db9f48610b4f7e7a9b43c489bc7130b2d2ab41a69b27dfd133ae0f8
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=3d+cardboard+letters+templates', which is likely intended to lead the user to a malicious site. The presence of a large number of external PDF links suggests a link farm or SEO poisoning attempt, likely to obscure the malicious redirector.

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.cc/pify?keyword=3d+cardboard+letters+templates
    • http://files.alleinarbeiten.de/uploads/1/3/1/4/131453990/760ebc7d.pdf
    • http://files.stopanddecide.com/uploads/1/3/1/8/131871739/buxofo.pdf
    • http://gisaf.veteransmusicfest.com/uploads/1/3/0/7/130739625/samomimorove_tokukoz_dolomiku.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9745/6801/files/exercicios_baixa_idade_media.pdf
    • https://cdn.shopify.com/s/files/1/0429/4718/2759/files/numawabapitikota.pdf
    • https://cdn.shopify.com/s/files/1/0434/7808/9878/files/89654939161.pdf
    • https://cdn.shopify.com/s/files/1/0430/2392/5402/files/bio_data_form_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/5128/4642/files/sipedetanapuke.pdf
    • https://cdn.shopify.com/s/files/1/0432/3970/2687/files/sulapamive.pdf
    • https://cdn.shopify.com/s/files/1/0433/7870/4536/files/44596510227.pdf
    • https://cdn.shopify.com/s/files/1/0433/7565/7121/files/arrl_antenna_handbook_download.pdf
    • https://cdn.shopify.com/s/files/1/0445/3921/6036/files/rababoxugabaduju.pdf
    • https://cdn.shopify.com/s/files/1/0434/8693/7248/files/73025469074.pdf
    • https://cdn.shopify.com/s/files/1/0431/1806/7876/files/zupesujabopi.pdf
    • https://cdn.shopify.com/s/files/1/0427/8901/1612/files/1775522968.pdf
    • https://cdn.shopify.com/s/files/1/0432/0015/1707/files/eclecticism_in_language_teaching.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_off0000647b.bin
afc4944ef0d41c32bb873ca99fe53201a9421c9d60900d0ef4e7a44fbc812010		 pdf-font-stream PDF embedded font (sfnt) at offset 0x647B 5428 bytes
font_01_sfnt_off000076bf.bin
dd163206d42df4202405c6249980a697744a59c712515700d060d6b12bc0a36b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76BF 9980 bytes

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