Malicious PDF — malware analysis report

Static analysis result for SHA-256 f799f2acdc464266…

MALICIOUS

PDF

34.6 KB Created: 2020-08-03 21:34:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f1a1ce061c938a601fb87c9e335578f SHA-1: 3caab3c4887cd93c1508439b4a6cb03da13f32e6 SHA-256: f799f2acdc464266292acf7ecdb073f82f1a7b354d9ff276d518eacecbccbe11
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a mass of external links, many of which are hosted on Shopify domains but point to a redirector. The primary malicious link, https://ttraff.cc/pify?keyword=cesar+roberto+bitencourt+tratado+de+direito+penal+pdf, is designed to redirect users to further malicious content. The document body itself contains garbled text and the title of a legal book, likely as a lure.

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=cesar+roberto+bitencourt+tratado+de+direito+penal+pdf
    • http://files.djukichstudios.com/uploads/1/3/1/6/131636692/xilotilotanibip_wipemibame_vikekun.pdf
    • http://files.hotrodtrailersales.com/uploads/1/3/0/7/130775221/dd53d788cf00d08.pdf
    • http://files.appleseedjunction.com/uploads/1/3/2/7/132740408/kasemepawuw_sefigujulozujaf_wujizovepavefi.pdf
    • http://files.cariblit.org/uploads/1/3/0/7/130738949/1327932.pdf
    • https://cdn.shopify.com/s/files/1/0427/7898/4614/files/gapuluditadusabaja.pdf
    • https://cdn.shopify.com/s/files/1/0430/6219/8425/files/gatopage.pdf
    • https://cdn.shopify.com/s/files/1/0431/8360/3873/files/18251152735.pdf
    • https://cdn.shopify.com/s/files/1/0432/9019/8180/files/9890759508.pdf
    • https://cdn.shopify.com/s/files/1/0434/6275/4461/files/33713828147.pdf
    • https://cdn.shopify.com/s/files/1/0429/8774/9525/files/lukizulalame.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7325/files/wukuwedon.pdf
    • https://cdn.shopify.com/s/files/1/0430/5652/9565/files/star_wars_battlefront_2_pc_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/4434/6792/files/50973499588.pdf
    • https://cdn.shopify.com/s/files/1/0431/3251/8554/files/50048778768.pdf
    • https://cdn.shopify.com/s/files/1/0435/2540/6874/files/zawura.pdf
    • https://cdn.shopify.com/s/files/1/0431/0509/1745/files/38057951518.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004808.bin
16f36086e59b8cbc3a42b8bad0cc546874fb0542da5d0233b8070b62b72f6967
pdf-font-stream PDF embedded font (sfnt) at offset 0x4808 5196 bytes
font_01_sfnt_off000059b7.bin
f35ccc961249cacafe0fe9d53863b5519b4933ddbe6b97b4aa578b3edc8b4e64
pdf-font-stream PDF embedded font (sfnt) at offset 0x59B7 11364 bytes