Malicious PDF — malware analysis report

Static analysis result for SHA-256 acb0198934e0dfb2…

MALICIOUS

PDF

87.7 KB Created: 2020-08-30 01:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5714faad4901640e79067ae4ad73c2f SHA-1: 806a64e235070f57130e824d23abd72eef75932d SHA-256: acb0198934e0dfb2ff2388556762e5d4053cbd761a98580182fd80a41dc89814
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.ru/wix?keyword=paquete+b%25C3%25A1sico+garantizado+de+salud+pdf`. The document body, though heavily obfuscated, contains text that appears to be a lure related to a 'health package'. The ML classifier also strongly indicated maliciousness. The primary attack pattern is social engineering via a deceptive PDF.

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=paquete+b%25C3%25A1sico+garantizado+de+salud+pdf
    • https://static.usrfiles.com/ugd/3bca44_becc4d04017749f28a8456791da9c849.pdf
    • https://static.usrfiles.com/ugd/b8c837_1a9516e8b5b54587bc831b248c94f678.pdf
    • https://static.usrfiles.com/ugd/97493d_ccebd5ad8a2d41bfb8f7a010f98a89f5.pdf
    • https://static.usrfiles.com/ugd/b0b521_1fc9854f6dc743da90af665fe83d0801.pdf
    • https://static.usrfiles.com/ugd/b8c837_f9abba6067f14abaa91de48c8a82056d.pdf
    • https://cdn.shopify.com/s/files/1/0433/0999/0043/files/berkeley_international_office_opt_reporting.pdf
    • https://cdn.shopify.com/s/files/1/0430/3175/6957/files/nexizesalit.pdf
    • https://cdn.shopify.com/s/files/1/0436/3599/8880/files/mutedetemopanet.pdf
    • https://cdn.shopify.com/s/files/1/0431/9910/3136/files/51184268126.pdf
    • https://cdn.shopify.com/s/files/1/0430/2562/9347/files/centrifugation_experiment.pdf
    • https://cdn.shopify.com/s/files/1/0440/1122/5246/files/95608893470.pdf
    • https://cdn.shopify.com/s/files/1/0462/5930/6645/files/bizhub_c368_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/givufixizosu.pdf
    • https://cdn.shopify.com/s/files/1/0440/4012/6614/files/bw3_menu.pdf
    • https://cdn.shopify.com/s/files/1/0428/6336/2204/files/wikuwatesadojupoj.pdf
    • https://cdn.shopify.com/s/files/1/0437/4154/4599/files/36385894904.pdf
    • https://cdn.shopify.com/s/files/1/0441/4645/8776/files/gapobumapasonenagukap.pdf
    • https://cdn.shopify.com/s/files/1/0435/5047/4403/files/22888797671.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_off00011603.bin
9fcba66b2145710f8044751eaacdc55b42cc99f15b1a69f7a9980871f8730764		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11603 5872 bytes
font_01_sfnt_off00012973.bin
a9e8f6420147d35979214add9d9af35a8a31ed05425d2a1b8845b1628afb02ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12973 11528 bytes

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