Malicious PDF — malware analysis report

Static analysis result for SHA-256 e09f69491696905d…

MALICIOUS

PDF

40.5 KB Created: 2020-08-07 05:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d802a4d57f8371034c7df3542437806b SHA-1: ad0ed4aa1e6aae5e81629c51769160dd78e86d4f SHA-256: e09f69491696905d1506238b58128c3119ce403a61f82bc1ac917ed451370deb
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one URL pointing to a known malicious redirector. The document body, though corrupted, contains text related to the topic of the links, suggesting a lure. The ML classifier strongly indicated maliciousness, and the PDF structure with numerous external links is consistent with SEO poisoning techniques used to distribute malware.

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=conversion+of+galvanometer+into+ammeter+and+voltmeter+pdf
    • http://files.kingdomgraphxx.com/uploads/1/3/0/9/130969080/e881e031b1f2.pdf
    • http://files.hookandarrow.co.nz/uploads/1/3/0/7/130776230/1b8b12c.pdf
    • http://lofavokis.erinboake.com/uploads/1/3/0/7/130776791/44fda0461e.pdf
    • http://files.thelostartoffemininity.com/uploads/1/3/1/4/131454024/a9e6a9c3b9.pdf
    • http://zizin.cgcatogo.com/uploads/1/3/2/7/132740405/tedogagotodatavudune.pdf
    • https://cdn.shopify.com/s/files/1/0429/5419/5097/files/saludoju.pdf
    • https://cdn.shopify.com/s/files/1/0437/6068/1111/files/array_to_string_javascript.pdf
    • https://cdn.shopify.com/s/files/1/0434/7166/7360/files/vezukerigulavewavobexera.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/70945418412.pdf
    • https://cdn.shopify.com/s/files/1/0429/5730/8063/files/wowudikuzef.pdf
    • https://cdn.shopify.com/s/files/1/0439/4608/2472/files/29259342862.pdf
    • https://cdn.shopify.com/s/files/1/0427/9464/7719/files/5690092203.pdf
    • https://cdn.shopify.com/s/files/1/0431/5987/9834/files/82253840203.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/76957488457.pdf
    • https://cdn.shopify.com/s/files/1/0434/3319/7718/files/59490762755.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5813/files/nemuxevoteloxesazakewevur.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004cc8.bin
f46154af5a8d5d803188cc51e607f261a2b0b97145ef3c266fd027cbc170a93d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CC8 5324 bytes
font_01_sfnt_off00005ed7.bin
78d8c9e7e3fd326c39248d29782e635bdec3fb55c73284f2aeca8c6d2e05388b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ED7 9328 bytes
font_02_sfnt_off00007ef9.bin
74a35dcac671789a1952909c7064e8f0092ccf84988030a41650584fa1b75142		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EF9 16192 bytes

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