Malicious PDF — malware analysis report

Static analysis result for SHA-256 b12ef904cc4d83d5…

MALICIOUS

PDF

47.0 KB Created: 2020-08-30 07:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcc0c390d933ce6b2726740e0059a141 SHA-1: 39453b0d028bb48aabaef7f36c4611a226784e8c SHA-256: b12ef904cc4d83d547435ed07f03c077c4065f3790702b1dcfc9139b794301c7
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a link farm. One of the primary links, https://ttraff.ru/wix?keyword=norman+geisler+systematic+theology, is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of the malicious redirector URL and the link farm structure strongly suggests an attempt to lure users to malicious sites.

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/wix?keyword=norman+geisler+systematic+theology
    • https://cdn.shopify.com/s/files/1/0435/6974/1983/files/58646595115.pdf
    • https://cdn.shopify.com/s/files/1/0437/5658/5114/files/pimapidoxonufovavilefuf.pdf
    • https://cdn.shopify.com/s/files/1/0429/0278/2111/files/amoxiclav_875_125_fachinformation.pdf
    • https://cdn.shopify.com/s/files/1/0427/4293/9814/files/44139904641.pdf
    • https://cdn.shopify.com/s/files/1/0435/2393/2311/files/examples_of_endothermic_and_exothermic_reactions_worksheet.pdf
    • https://static.usrfiles.com/ugd/97493d_9dd0a02004eb434bbda1ce0bb7036d6a.pdf
    • https://static.usrfiles.com/ugd/b8c837_7383c48d06cb41799bd6d22c2e475cff.pdf
    • https://static.usrfiles.com/ugd/724bd4_9b695894b15b47c28cfe0f4ad76d0b52.pdf
    • https://static.usrfiles.com/ugd/defcb2_224d628370134cc7bf32e4013a27f2fd.pdf
    • https://static.usrfiles.com/ugd/4d6844_58f4e540478c4043880d4046607fb358.pdf
    • https://static.usrfiles.com/ugd/b8c837_d53c813b39384ea69b22a4bb0eea8fe8.pdf
    • https://static.usrfiles.com/ugd/b8c837_497dc99242c144dbba8b873bab2c1a97.pdf
    • https://static.usrfiles.com/ugd/e2c250_3978eb5d22424550bfd387ec4da13efc.pdf
    • https://static.usrfiles.com/ugd/b8c837_0dbb8c5f67c64c6e89d56df9f1fa27d9.pdf
    • https://static.usrfiles.com/ugd/b8c837_d89f4c1daefa4a51ba6be8fbc032956c.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_off00006b44.bin
99c87b339464a2264720c0c97d687201f1a46bd96f63a4a076d03ff40327e1bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B44 5072 bytes
font_01_sfnt_off00007c52.bin
d77e8a6f0405155d6ea8fcc54365c67a5cd75952eab77637a3eb3989cfc41a2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C52 10400 bytes
font_02_sfnt_off00009fb3.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FB3 4324 bytes

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