Malicious PDF — malware analysis report

Static analysis result for SHA-256 cddba8a1252a7e93…

MALICIOUS

PDF

54.6 KB Created: 2020-08-28 01:39:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d5867985feae0d24334d76963da62d7 SHA-1: be3c73db03d9819ff65a6e7cadb1da942d294124 SHA-256: cddba8a1252a7e934003d6eb66c8c86968ded67a044bb96af4892c76b9ead429
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a search result for '5 star hotels in duluth mn'. The document also functions as a link farm, pointing to numerous PDFs hosted on Shopify, one of which is also identified as a potential redirector. The ML classifier strongly indicates maliciousness, and the overall structure suggests a phishing or redirection attempt.

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/pify?keyword=5+star+hotels+in+duluth+mn
    • http://gigemag.dhsupwardbound.com/uploads/1/3/0/7/130738697/damiratugujovugeme.pdf
    • http://files.knot-not.com/uploads/1/3/1/3/131380875/c7dd01933d1b6d6.pdf
    • https://cdn.shopify.com/s/files/1/0433/3882/5887/files/xowuvinitolorokitezegobu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8974/0441/files/tuvedesulabataminoz.pdf
    • https://cdn.shopify.com/s/files/1/0434/3191/9765/files/5777391503.pdf
    • https://cdn.shopify.com/s/files/1/0435/0600/8216/files/batozarozajomix.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/vepixawi.pdf
    • https://cdn.shopify.com/s/files/1/0438/5187/4466/files/gubiwesadolek.pdf
    • https://cdn.shopify.com/s/files/1/0438/0796/5345/files/company_profile_template_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/2371/9845/files/urie_bronfenbrenner_ecological_systems_theory.pdf
    • https://cdn.shopify.com/s/files/1/0435/6177/9359/files/movajivore.pdf
    • https://cdn.shopify.com/s/files/1/0428/1221/1359/files/da_2823_fillable.pdf
    • https://cdn.shopify.com/s/files/1/0432/5759/4011/files/luigi_s_mansion_rom.pdf
    • https://cdn.shopify.com/s/files/1/0440/0994/7301/files/thanos_your_home_meme_template.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_off00009358.bin
3bb27a49b152fa4452bf4870789b527622d377b3c76166c07b56d0a36fd75444
pdf-font-stream PDF embedded font (sfnt) at offset 0x9358 5092 bytes
font_01_sfnt_off0000a471.bin
c8048e2e2e00e1d0a2ad0dfd9fec01ec6330de437734810b2fb19337d6d307fa
pdf-font-stream PDF embedded font (sfnt) at offset 0xA471 12676 bytes