Malicious PDF — malware analysis report

Static analysis result for SHA-256 210992726d7f1f75…

MALICIOUS

PDF

44.8 KB Created: 2020-10-29 22:43:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1e2e7f2dd70ac2ebe0c05d3d9f52a6f SHA-1: 1e50a27ebc04708fa672979d7cbbcf5db3728978 SHA-256: 210992726d7f1f75ec32763c5a468d200252eb49a498820093b903fc8492d94e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF SEO link farm, with numerous external PDF links. The document body contains a URL that appears to be the primary malicious link.

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://gettraff.ru/strik?keyword=senior+t+shirt+design+2020
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/sofik_jerisaxezeli_duzumade.pdf
    • https://pesawesezopi.weebly.com/uploads/1/3/4/3/134327800/wesarofebaz-dedoja-bafirena-wofabof.pdf
    • https://sowameneritela.weebly.com/uploads/1/3/0/7/130775755/2124830.pdf
    • https://xumogimunosu.weebly.com/uploads/1/3/1/6/131607683/167060.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/subud/area_of_complex_shapes_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0500/3057/5787/files/lego_city_train.pdf
    • https://s3.amazonaws.com/felasorarabipis/zogawibijezosiroxinokuf.pdf
    • https://s3.amazonaws.com/fosagoba/antigenic_shift_and_antigenic_drift.pdf
    • https://cdn.shopify.com/s/files/1/0491/8696/3622/files/gixesademeki.pdf
    • https://cdn.shopify.com/s/files/1/0504/8057/8720/files/acc_aha_guidelines_acs_2020.pdf
    • https://s3.amazonaws.com/felasorarabipis/39455887783.pdf
    • https://cdn.shopify.com/s/files/1/0431/1960/7962/files/tefanesusonelotutudegage.pdf
    • https://cdn.shopify.com/s/files/1/0501/9897/0543/files/rave_master_anime_reboot.pdf
    • https://cdn.shopify.com/s/files/1/0266/9556/5499/files/96377139051.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_off00006e66.bin
1b2b456111dc09092fe3a358d549e3aaa615c9310bf527875ee9ca1c617a1a5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E66 5220 bytes
font_01_sfnt_off00008025.bin
a45e14afbc8224c17b26c0d37ce01225df769bff6a982f7a805da65eec681997
pdf-font-stream PDF embedded font (sfnt) at offset 0x8025 11232 bytes