Malicious PDF — malware analysis report

Static analysis result for SHA-256 1485e91606706c8d…

MALICIOUS

PDF

40.4 KB Created: 2020-08-17 11:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 79d680e6144b765613ca0872ec51c1df SHA-1: 1b45b61a76e3879f8a4c070706adcbd4fc841d25 SHA-256: 1485e91606706c8d1189f4186ff067e91f51ecdbc750d9f66269e645da6fcea2
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to potentially malicious or SEO-farmed content, including a redirector at 'ttraff.cc'. The document body, though heavily obfuscated, contains references to educational topics and URLs, suggesting a lure to disguise malicious intent. The ML classifier strongly indicates maliciousness, supporting the attack pattern of using a document to redirect users to harmful sites.

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=symmetry+worksheets+ks2+year+6
    • http://nejuf.allwrappedup12414.com/uploads/1/3/2/6/132681490/zobezewikolirob-lonotu-sipufoxikogu.pdf
    • http://files.oregonwaterpolo.org/uploads/1/3/1/0/131070378/d24f8ae20c.pdf
    • http://piral.itespto.com/uploads/1/3/1/1/131163599/3666543.pdf
    • http://files.charlottebats.com/uploads/1/3/2/7/132740285/3555029.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/4024/1829/files/what_are_webhooks_in_discord.pdf
    • https://cdn.shopify.com/s/files/1/0440/6099/9830/files/30961750087.pdf
    • https://cdn.shopify.com/s/files/1/0435/2504/6431/files/path_dependence.pdf
    • https://cdn.shopify.com/s/files/1/0432/1338/9992/files/mathematical_methods_for_economics_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/7173/3917/files/bobujizurev.pdf
    • https://cdn.shopify.com/s/files/1/0438/2811/7661/files/ultrasound-_guided_subcostal_transversus_abdominis_plane_block.pdf
    • https://cdn.shopify.com/s/files/1/0430/3618/0634/files/80491927165.pdf
    • https://cdn.shopify.com/s/files/1/0433/7680/3990/files/65782331912.pdf
    • https://cdn.shopify.com/s/files/1/0431/2947/1130/files/doburewokexodovarubojimu.pdf
    • https://cdn.shopify.com/s/files/1/0430/1085/0979/files/68441485648.pdf
    • https://cdn.shopify.com/s/files/1/0440/8619/8424/files/cavidades_del_corazon_humano.pdf
    • https://cdn.shopify.com/s/files/1/0437/9744/6818/files/dajegisafodunobe.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_off00005f30.bin
39b3ae94e574f7e6f0f2cad8399760792ff0ddb9d9d59c3f86a1ff181d25f4e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F30 5540 bytes
font_01_sfnt_off000071f8.bin
4037d4fa43aa8e3b3358018ae4a91434c26f283f38e0262a684e109e9f2c604b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71F8 10320 bytes

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