Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a830a8d7a58a871…

MALICIOUS

PDF

47.7 KB Created: 2020-08-03 23:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 209c42cf801c5b43fb9e0a3c6ce00faa SHA-1: 772e00e4010b7b356b4c32d310b28ee0c9bcb2a7 SHA-256: 0a830a8d7a58a871ca48a920ef5e8282623225e8aba8434333405b28ab0389e2
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to benign Shopify domains, but one prominent link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=zoology+reference+books+pdf', suggesting a lure to a phishing or malware distribution site. The ML classifier strongly flagged this PDF as malicious, supporting the presence of malicious redirector links.

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.com/pify?keyword=zoology+reference+books+pdf
    • http://files.gospelkc.org/uploads/1/3/2/7/132712664/405b8f3aca.pdf
    • http://files.creativconcepts.studio/uploads/1/3/1/8/131856646/dae28d3.pdf
    • http://direzunip.johnpaynter.me/uploads/1/3/1/6/131606201/dekudukoto-mavimawepevinis-lugenilivazut.pdf
    • http://files.cowbirdlab.org/uploads/1/3/0/9/130969761/pelododebi-wufejumeduxisam-puxaweroxapudi.pdf
    • http://files.cliniqueveterinairedecantley.com/uploads/1/3/0/7/130739288/970ea.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6842/3334/files/dumuxizobenuvejal.pdf
    • https://cdn.shopify.com/s/files/1/0429/5265/5002/files/k_fold_cross_validation.pdf
    • https://cdn.shopify.com/s/files/1/0434/0717/9941/files/runeperutetewakarolo.pdf
    • https://cdn.shopify.com/s/files/1/0438/0586/8193/files/plies_da_realist_songs.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49839171509.pdf
    • https://cdn.shopify.com/s/files/1/0435/4975/3493/files/54441864517.pdf
    • https://cdn.shopify.com/s/files/1/0433/4800/0927/files/77332664851.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/datufezon.pdf
    • https://cdn.shopify.com/s/files/1/0439/1501/8392/files/10959478753.pdf
    • https://cdn.shopify.com/s/files/1/0435/8216/1053/files/sao_fatal_bullet_cheat_engine_table.pdf
    • https://cdn.shopify.com/s/files/1/0434/5711/8374/files/spotify_error_code_17.pdf
    • http://www.mnh.si.edu/rc/
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b52.bin
06dff4db9e4ef59a00b5bec6f085c7301eb8197a3c87b98faecb7427cfcaa650		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B52 5376 bytes
font_01_sfnt_off00006db5.bin
7bb91423d63eb6bd7c2657278979848d60b7d38679106ec23dbd755ba6ab3d32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DB5 2320 bytes
font_02_sfnt_off00007805.bin
e1b90fb81917a2d510b3d1f655fece6737b79de459f912c9efed9b67081e5b8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7805 10560 bytes
font_03_sfnt_off00009c17.bin
5f3bf50395e8d1b65f29ab90a426c3665da69f8437ae50e88eef237d5e22552a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C17 16224 bytes

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