Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5c7845356b9b248…

MALICIOUS

PDF

63.6 KB Created: 2020-07-24 00:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7c750e870cf7e4b3359b1e5f8ebbf21 SHA-1: 53b1e1b28578bd44811d0b2f686b2ec2ed99f580 SHA-256: a5c7845356b9b2482130899e6a1460e677fe286ab1363ed9da6ea4234492d317
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing indicating it redirects to known malicious infrastructure. The primary malicious URL identified is 'https://ttraff.ru/wb?keyword=neoteny%20and%20paedogenesis%20in%20amphibians%20pdf'. The document body appears to be obfuscated or corrupted, but the presence of numerous links, including a large number of SEO-optimized PDF links pointing to cdn.shopify.com, suggests a link farm or redirection strategy. The ML classifier also strongly flagged this PDF as malicious.

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/wb?keyword=neoteny%20and%20paedogenesis%20in%20amphibians%20pdf
    • http://files.thepointlessgrandma.co.uk/uploads/1/3/0/7/130776081/sabugumemifux_rotoxeloveg_puzewidokevod.pdf
    • http://files.mlphotoservice.com/uploads/1/3/1/4/131408029/dogometagimubalugek.pdf
    • http://files.aeherting.com/uploads/1/3/1/3/131382630/ribenugixedofi_setukonedi_silewagisifogug_velix.pdf
    • http://files.sunburyhealthcentre-ppg.com/uploads/1/3/0/7/130775645/715bfefd8323.pdf
    • http://files.breakalegman.com/uploads/1/3/0/7/130775952/e5aab3789de272.pdf
    • http://files.aeherting.com/uploads/1/3/1/3/131382630/ribenugixedofi_setukonedi_silewagisif
    • https://cdn.shopify.com/s/files/1/0435/4464/1695/files/74127512118.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/85838247634.pdf
    • https://cdn.shopify.com/s/files/1/0438/2087/5938/files/85934243610.pdf
    • https://cdn.shopify.com/s/files/1/0431/8609/4248/files/narikited.pdf
    • https://cdn.shopify.com/s/files/1/0429/0061/9423/files/weteg.pdf
    • https://cdn.shopify.com/s/files/1/0432/8167/8494/files/kukazujojanufas.pdf
    • https://cdn.shopify.com/s/files/1/0429/5481/7690/files/lukiminajuxesaj.pdf
    • https://cdn.shopify.com/s/files/1/0432/5552/9640/files/98397385637.pdf
    • https://cdn.shopify.com/s/files/1/0427/9877/6487/files/10040588012.pdf
    • https://cdn.shopify.com/s/files/1/0429/1310/4035/files/68666549227.pdf
    • https://cdn.shopify.com/s/files/1/0431/5293/3018/files/77720779280.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zijuk.pdf
    • https://cdn.shopify.com/s/files/1/0431/9635/0624/files/53837289488.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_off0000b97d.bin
3812f0e5af0777e73ccb73f642db5a93b6a98bcd0ee83a923d490699356858f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB97D 5328 bytes
font_01_sfnt_off0000cb84.bin
7f514b8b9e746f961f516d7571c1c76cd3be1e43cb75146318b8385caab28499		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB84 11200 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.