Malicious PDF — malware analysis report

Static analysis result for SHA-256 778fe3bd5aa48f99…

MALICIOUS

PDF

42.4 KB Created: 2020-08-12 00:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32aa59019e0b4222f12942adefa48c08 SHA-1: 45c8733ff051dedbb04c9d734f846a91bde55a4d SHA-256: 778fe3bd5aa48f99fa449c7858802c673a2973f20ea53f81883bbdb67630db6c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external resources, suggesting a link farm or redirection attempt. One prominent URL, 'https://ttraff.ru/pify?keyword=centroide+y+centro+de+gravedad+estatica+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body itself is heavily obfuscated and contains what appears to be a URL, further supporting the malicious redirection pattern.

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=centroide+y+centro+de+gravedad+estatica+pdf
    • http://files.melissayvonnephotography.com/uploads/1/3/0/7/130775033/weninu.pdf
    • http://files.theradiancerefinery.com/uploads/1/3/2/7/132740564/kufosafe.pdf
    • http://files.berryblueboutique.net/uploads/1/3/1/1/131163540/2195466.pdf
    • http://files.maninithoughts.com/uploads/1/3/1/6/131607093/koxesidipegor_wolaxobadeletul_lezijix.pdf
    • http://files.gcchapel.org/uploads/1/3/1/4/131452887/budanuvopiguxema.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0088/8469/files/99373804693.pdf
    • https://cdn.shopify.com/s/files/1/0436/3059/2160/files/wexasipesize.pdf
    • https://cdn.shopify.com/s/files/1/0437/3587/5745/files/32442364046.pdf
    • https://cdn.shopify.com/s/files/1/0431/6626/9597/files/worugowilob.pdf
    • https://cdn.shopify.com/s/files/1/0435/2465/3224/files/17956563133.pdf
    • https://cdn.shopify.com/s/files/1/0429/2195/1391/files/musimewoforile.pdf
    • https://cdn.shopify.com/s/files/1/0432/6588/4313/files/liruzititodibazerexeza.pdf
    • https://cdn.shopify.com/s/files/1/0430/2392/5402/files/xawerajisobefovasibani.pdf
    • https://cdn.shopify.com/s/files/1/0433/7028/3166/files/bioassay_of_heparin.pdf
    • https://cdn.shopify.com/s/files/1/0432/2387/5746/files/command_line_merge_linux.pdf
    • https://cdn.shopify.com/s/files/1/0432/4065/2960/files/28767016353.pdf
    • https://cdn.shopify.com/s/files/1/0433/8499/5991/files/368985194.pdf
    • https://cdn.shopify.com/s/files/1/0437/4292/0869/files/sasisini.pdf
    • https://cdn.shopify.com/s/files/1/0431/7157/8007/files/minor_arcana_tarot.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_off00005a8e.bin
4b775b1a2b2a87ee0f2f6b49e163a84d6c037024fc234c60e02ff3fdc68f4e6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A8E 5356 bytes
font_01_sfnt_off00006ce5.bin
85040a08634c3e59dabfb69cbc47bd5a0002e9b27b146ee14c10a27a608fa978		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE5 15424 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.