Malicious PDF — malware analysis report

Static analysis result for SHA-256 58c42c9dc4d43652…

MALICIOUS

PDF

36.3 KB Created: 2020-08-10 09:35:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd482f3dd8e4d9fe655e29d594504fa9 SHA-1: a58a1cdadad0989c0b3364a3899dfa96a93f361c SHA-256: 58c42c9dc4d43652da742d1068e2027c30610a20a126c9c34a32740c1ead56b5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector infrastructure, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=flame+broiler+menu+pdf', suggesting a lure to a malicious site. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDFs, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly flagged this PDF as malicious.

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=flame+broiler+menu+pdf
    • http://files.png1960.org/uploads/1/3/1/1/131163635/xepuwuzodikuduba.pdf
    • http://ziluju.socalasta.com/uploads/1/3/1/4/131409909/4767460.pdf
    • http://files.gracebaptistchurch77.com/uploads/1/3/0/8/130873957/1856517.pdf
    • http://files.valnettoyage-sarl.ch/uploads/1/3/1/8/131857562/3861994.pdf
    • https://cdn.shopify.com/s/files/1/0432/0336/2973/files/wijurizesodi.pdf
    • https://cdn.shopify.com/s/files/1/0435/2973/2248/files/37545537998.pdf
    • https://cdn.shopify.com/s/files/1/0440/9711/0168/files/xbox_one_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0438/8497/0139/files/rukejovefiwaj.pdf
    • https://cdn.shopify.com/s/files/1/0437/5491/3950/files/bipedebesiwejoveza.pdf
    • https://cdn.shopify.com/s/files/1/0432/1473/3480/files/29182975208.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97428896976.pdf
    • https://cdn.shopify.com/s/files/1/0429/1526/6713/files/76843566366.pdf
    • https://cdn.shopify.com/s/files/1/0430/6465/6026/files/online_gdb_compiler.pdf
    • https://cdn.shopify.com/s/files/1/0437/6815/2216/files/84928204974.pdf
    • https://cdn.shopify.com/s/files/1/0432/0621/3789/files/powewoxefiguxe.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/agronomy_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0737/6546/files/alice_in_wonderland_musical_script.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_off00005109.bin
f27f4b98011db1da3d92f73a1eafca2d5de7564f5d11fd9beccbbdddb08868f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5109 5104 bytes
font_01_sfnt_off00006248.bin
a58237967ce1037858e98604d40df7aa89fff2059548b4f41f9f942c9e3cb718		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6248 10100 bytes

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