Malicious PDF — malware analysis report

Static analysis result for SHA-256 070e7620853fc50f…

MALICIOUS

PDF

43.5 KB Created: 2020-08-03 07:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52b878f6b1a6c56f5b90ef326d4ccdc4 SHA-1: a5350c6f406b222930e1def39cd71c507df3eb3f SHA-256: 070e7620853fc50f151856cc32a7ee68df774757bdd5d803b493ee3b5cdc9916
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'poker books pdf free download' and a URL that appears to be part of a link farm designed to manipulate search engine results. The presence of embedded links and the ML classifier's high confidence indicate a malicious intent to redirect users to potentially harmful content.

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=poker+books+pdf+free+download
    • http://files.optimistclubofcarlsbad.org/uploads/1/3/1/4/131453598/660036691b4e.pdf
    • http://files.anazaofitnessgear.com/uploads/1/3/2/6/132695692/rajofupi.pdf
    • http://files.patcolburn.com/uploads/1/3/1/4/131406258/xijajojoborivi_ruteza.pdf
    • http://files.qcstriders.com/uploads/1/3/1/3/131378932/4731494.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6702/3253/files/lizomalakobuf.pdf
    • https://cdn.shopify.com/s/files/1/0439/1705/0008/files/98050009148.pdf
    • https://cdn.shopify.com/s/files/1/0446/6756/8291/files/minecraft_skins_pocket_edition_ipad.pdf
    • https://cdn.shopify.com/s/files/1/0429/8987/9445/files/nojigugoxeremem.pdf
    • https://cdn.shopify.com/s/files/1/0434/1992/6679/files/rudekeralegugoxugijoxe.pdf
    • https://cdn.shopify.com/s/files/1/0438/2785/5522/files/vapafesafi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8413/6086/files/73111418190.pdf
    • https://cdn.shopify.com/s/files/1/0434/2457/9751/files/weider_ultimate_body_works_exercises_chart.pdf
    • https://cdn.shopify.com/s/files/1/0437/0310/7752/files/41548494208.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_off00006cfb.bin
c345648bab749edc8f5cdb1a9ba7da1b766924bb8a0d3879a4c32670ec1d3906
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CFB 5332 bytes
font_01_sfnt_off00007f3c.bin
32ead614096ebbfe9e84e99fde9421474dd4a0c628e36fdf121f3626b4c8e1a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F3C 10012 bytes