Malicious PDF — malware analysis report

Static analysis result for SHA-256 c868a81c157e3d88…

MALICIOUS

PDF

36.2 KB Created: 2020-08-22 09:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d33d3c66945098cd9416b9f3ecadae07 SHA-1: adf87c742b3035bc5b5002baa745e8d537195a66 SHA-256: c868a81c157e3d88df13c8ebc1ef291c92065528ea0719c1a466ef45d37954ca
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including one pointing to a known malicious redirector at 'https://ttraff.ru/pify?keyword=blood+cancer+report+pdf+file'. The document body, though heavily obfuscated, contains text suggesting a lure related to a 'blood cancer report pdf file'. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports a malicious intent to drive traffic to potentially harmful sites.

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=blood+cancer+report+pdf+file
    • http://xakejenun.exercisewithtracy.co.uk/uploads/1/3/1/4/131407901/rogilaxinodibovamozi.pdf
    • http://files.martinisdigz.com/uploads/1/3/1/4/131437508/bavagul.pdf
    • http://vufesimi.warriorweekend.net/uploads/1/3/1/3/131383544/3078261.pdf
    • https://cdn.shopify.com/s/files/1/0432/0775/3888/files/population_genetics_and_evolution.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bibekejufalakudogaloseja.pdf
    • https://cdn.shopify.com/s/files/1/0431/1102/2756/files/xazewurut.pdf
    • https://cdn.shopify.com/s/files/1/0435/3523/7269/files/archeage_gear_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/8155/6375/files/fukonobagapivoropupab.pdf
    • https://cdn.shopify.com/s/files/1/0430/8752/8103/files/steven_universe_future_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0433/5098/2805/files/cement_manufacturing_plant.pdf
    • https://cdn.shopify.com/s/files/1/0433/8316/0999/files/jolirakakozoderuz.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/katikukasosigaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/2599/7722/files/35276901628.pdf
    • https://cdn.shopify.com/s/files/1/0463/5607/0561/files/sawiwezifufu.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_off00004fa8.bin
9eaf632bc3572c8a41e59e2cf70ba2e49fe0d9efce38dd21e66b5b654e838afe
pdf-font-stream PDF embedded font (sfnt) at offset 0x4FA8 5020 bytes
font_01_sfnt_off000060c3.bin
52c1b24afb9397eb01318dcce36f68e1bf6962d39dd82ef357e4f7f9c6fbdf25
pdf-font-stream PDF embedded font (sfnt) at offset 0x60C3 10356 bytes