Malicious PDF — malware analysis report

Static analysis result for SHA-256 44add91ae9f237d2…

MALICIOUS

PDF

83.8 KB Created: 2020-08-30 16:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9e3d4d5d579a7debfbb73dc22804abd SHA-1: f22500283ed99db7574f1fcd22d7767807544ff8 SHA-256: 44add91ae9f237d22733dc7c19ddc32d174b63664767b24e0989968a8571a5e1
152 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one identified as a malicious redirector. This redirector is likely used to funnel users to a malicious site, potentially for phishing or malware distribution. The document body, though heavily obfuscated, contains the same URL as a link, suggesting it's the primary lure. The ML classifier strongly indicated maliciousness.

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=digimon+cyber+sleuth+digivolution
    • https://static.usrfiles.com/ugd/b8c837_15d987383e264efbaaf12855d5cf5ee2.pdf
    • https://static.usrfiles.com/ugd/b8c837_1e0f500d713148e38461148786b0980f.pdf
    • https://static.usrfiles.com/ugd/b8c837_e2a89813248842adba99f71001887dc0.pdf
    • https://static.usrfiles.com/ugd/efb3f0_4efe735627034ecbadf425456bca1eb5.pdf
    • https://static.usrfiles.com/ugd/b8c837_ec80e12df15e4f289b8c212a7c91ffeb.pdf
    • https://static.usrfiles.com/ugd/b8c837_141f0f9e7f1e415c9ec98f0b51bc9b19.pdf
    • https://static.usrfiles.com/ugd/cc089a_f4e71246d0cb41e4b005b75775e08553.pdf
    • https://static.usrfiles.com/ugd/2f07a1_1151ca9ee3bf4311b98ff3c496f03c1f.pdf
    • https://cdn.shopify.com/s/files/1/0434/3506/5505/files/zplot_software_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/6381/1997/files/65945065412.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1650/files/99619139434.pdf
    • https://cdn.shopify.com/s/files/1/0434/1966/4533/files/58579631956.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_off0000cd84.bin
93d82389c944e4d1c81f1688674dd0c5b8ebdc2e884c00499af95e7aa65a3f95
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD84 19592 bytes
font_01_sfnt_off00010ad4.bin
fde0e7b38f19525b7dc16d93da97327e0d87ec2299135d5fcd33164b580376e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD4 5444 bytes
font_02_sfnt_off00011d33.bin
43e20634f68c313300db44f546b2dbeb0552d54de8fcef3d1050609413942f1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D33 10236 bytes