Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16c5ac341af371c…

MALICIOUS

PDF

43.8 KB Created: 2020-08-31 07:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27ee854331ad7733533d94ba534dae0f SHA-1: 9884efaaade876d9b391a47fa6d52af007dbb2be SHA-256: c16c5ac341af371c7ca490d46d4697d73426423c928e2cfed4bedf388f81bad8
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one prominent link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/wix?keyword=dark+messiah+cheats', suggesting a lure to potentially malicious content. The ML classifier strongly indicated maliciousness, and the PDF structure itself is indicative of a link farm designed to distribute malware or phishing 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.cc/wix?keyword=dark+messiah+cheats
    • https://static.usrfiles.com/ugd/01bc73_e023c592187f41989ca3941a530366ce.pdf
    • https://static.usrfiles.com/ugd/b8c837_d70c5c6f37024ce0901cfea14c0efcb7.pdf
    • https://static.usrfiles.com/ugd/0049ca_9df83062831c40d585f2f59ec726061e.pdf
    • https://static.usrfiles.com/ugd/0df15e_bc1fc0e9b7bd40b79d5fecdc2e2e0a7a.pdf
    • https://static.usrfiles.com/ugd/a1fb72_0a19f3856a1142a38ab382124a3e5d9c.pdf
    • https://cdn.shopify.com/s/files/1/0433/4302/0183/files/51777374971.pdf
    • https://static.usrfiles.com/ugd/6116da_399cfa053e074334b8f883c3ec87ba4e.pdf
    • https://static.usrfiles.com/ugd/b8c837_c4a465b6bae845dab4d15d374d697843.pdf
    • https://static.usrfiles.com/ugd/c3f88d_14d228d579484edda879091c0e432064.pdf
    • https://static.usrfiles.com/ugd/edb4a7_c2193f0c08f040d2baeadf743be368ac.pdf
    • https://cdn.shopify.com/s/files/1/0434/8503/6708/files/bevisijubebexanavuxi.pdf
    • https://cdn.shopify.com/s/files/1/0433/8289/8840/files/basic_english_sentences.pdf
    • https://cdn.shopify.com/s/files/1/0431/5139/2922/files/zarabujinovemojuzugisakiv.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_off000066f3.bin
8ddba072960ef81441047c8879eb2b8c9f2a7cb67d452c7f490ffb3246eae5b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x66F3 5068 bytes
font_01_sfnt_off0000780d.bin
305870b2e26bf4e1076442c38dc2fa6d88e96e807cf9977b10e99d91d14f6d74
pdf-font-stream PDF embedded font (sfnt) at offset 0x780D 13620 bytes