Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e52a66993d9c513…

MALICIOUS

PDF

51.7 KB Created: 2020-08-09 06:39:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4453544efd0515acbc334d61d63a28f SHA-1: 8762a8792ce70acbc265423015dfc98809bf40b8 SHA-256: 6e52a66993d9c5136c5d1e9505936d594214e6799c403465820f9badb21e1db7
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one prominently pointing to a known malicious redirector. The document body, though heavily obfuscated, also contains the same URL, suggesting an attempt to direct users to malicious infrastructure. The presence of numerous other PDF links further indicates a link farm or redirection strategy. No scripts were extracted, but the malicious URL is the primary indicator of compromise.

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=ammaniti+come+dio+comanda+pdf
    • http://kekix.bridlewiseridingacademy.com/uploads/1/3/0/7/130739777/seresulivodu-midupiwikujo.pdf
    • http://files.juliamontgomery.com/uploads/1/3/0/9/130969985/nimutegavidis.pdf
    • http://files.anticsofsusieq.com/uploads/1/3/2/7/132740384/7981806.pdf
    • http://nowubara.redcientificaescolar.com/uploads/1/3/1/3/131380600/lifug.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/3462/4679/files/kuvedulibapajofimejopovos.pdf
    • https://cdn.shopify.com/s/files/1/0431/8851/9080/files/6347342894.pdf
    • https://cdn.shopify.com/s/files/1/0429/3220/7782/files/world_map_countries_and_continents.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4653/files/54339847870.pdf
    • https://cdn.shopify.com/s/files/1/0437/0307/4984/files/backshift_of_tenses_bungen.pdf
    • https://cdn.shopify.com/s/files/1/0430/5335/1066/files/xazalumilazimo.pdf
    • https://cdn.shopify.com/s/files/1/0429/7555/9829/files/18239523102.pdf
    • https://cdn.shopify.com/s/files/1/0432/7328/9888/files/67604437433.pdf
    • https://cdn.shopify.com/s/files/1/0429/8889/6415/files/besikobuz.pdf
    • https://cdn.shopify.com/s/files/1/0438/0105/1293/files/mukavebukovoxigugiw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d5d.bin
9521c19ae981651565034b5ea78a35d63839b33e9178868d37986f52b5e0c33f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D5D 4772 bytes
font_01_sfnt_off00008d6f.bin
c23bc7d8204f8a965ee5fbbeac1a733e02767a5e9d98bf88045d7e8d97912811		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D6F 11384 bytes
font_02_sfnt_off0000b21a.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB21A 4324 bytes

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