Malicious PDF — malware analysis report

Static analysis result for SHA-256 6971a118f86def33…

MALICIOUS

PDF

47.0 KB Created: 2020-09-08 22:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58c316fe8edf57677a717cb6d9ae22ef SHA-1: 5f48ccfcae9cd46ac5e2378511089c1b1a4efa10 SHA-256: 6971a118f86def33983f70b89b3dd21e8f1e87bf37374cf048503c296555a3f7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, which is a common tactic for phishing and malware distribution. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure for an application form.

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.link/wix?keyword=aviva+myshield+app+form
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b13fd1_471aa9b2f0da426381d3f25b1c5e4ad9.pdf
    • https://static.usrfiles.com/ugd/43d598_080069e7979448c58887aff0c5cc6c6a.pdf
    • https://static.usrfiles.com/ugd/5be868_f7d4bb142c4d47df8cd17f1ae59ffb3d.pdf
    • https://cdn.shopify.com/s/files/1/0438/8136/5659/files/31113095968.pdf
    • https://cdn.shopify.com/s/files/1/0437/6369/5770/files/nuburaxezedag.pdf
    • https://cdn.shopify.com/s/files/1/0433/6844/8152/files/41438384017.pdf
    • https://cdn.shopify.com/s/files/1/0461/3180/6376/files/jivigusaw.pdf
    • https://static.usrfiles.com/ugd/08e331_1815906efe7048e2be15b1408e6258bf.pdf
    • https://static.usrfiles.com/ugd/3b47cb_00feea1a46c847859428877ce4825365.pdf
    • https://static.usrfiles.com/ugd/b7ed05_0c89150e4b474b38893b95a10f8afe48.pdf
    • https://static.usrfiles.com/ugd/0010c8_b7de2dbf7fc3423187e730b28747ec7b.pdf
    • https://static.usrfiles.com/ugd/8a05ec_6439b5157b914b048d28cb30f552d6c4.pdf
    • https://static.usrfiles.com/ugd/bb4607_c457070b84b842259361fb99d95c3308.pdf
    • https://static.usrfiles.com/ugd/b8c837_021dee25c95341489ef6f70a4491334d.pdf
    • https://static.usrfiles.com/ugd/0dcf4b_ddc1d15f45ca4ef7854f04e89fc86d0e.pdf
    • https://static.usrfiles.com/ugd/e49726_d4f626b71e664699a53d57ef3a4a570b.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000078b6.bin
980bb3f80af6334c81e89feaafa53dd5fe63f1e1df45275258bd27aba01096e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x78B6 5432 bytes
font_01_sfnt_off00008b15.bin
70997c00ad2bdffcdf8bff4867ce96eb6ae7707136dc112b3fe025b444b9ec7d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B15 10684 bytes