Malicious PDF — malware analysis report

Static analysis result for SHA-256 59b637dc30109852…

MALICIOUS

PDF

41.9 KB Created: 2020-08-23 02:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de72f45b5f4cf30d65d354b0f69f7e4b SHA-1: a9bbc077be9f8e529c4b3fdb25de154fdf4b1978 SHA-256: 59b637dc30109852a5db989a2faf086a56849326146199fde4e0ec31bfd2d993
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, also contains the URL https://ttraff.ru/pify?keyword=chrome+devtools+performance+monitor, suggesting a lure related to developer tools. The presence of numerous links to Shopify-hosted PDFs indicates a potential SEO-spam or link-farming operation designed to drive traffic to malicious infrastructure.

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=chrome+devtools+performance+monitor
    • http://files.alimccann.net/uploads/1/3/0/7/130775921/398c4a6b4.pdf
    • http://files.personalizedbyemily.com/uploads/1/3/1/6/131606046/wazubaxipogapat.pdf
    • http://desupigu.retroca.com/uploads/1/3/0/7/130739892/7854976.pdf
    • http://files.chuckpotterart.net/uploads/1/3/1/6/131607440/rijunutusubupun-mutijo-ziduxus-nukabuled.pdf
    • http://files.eatwellwithwilson.com/uploads/1/3/2/7/132712251/5553541.pdf
    • https://cdn.shopify.com/s/files/1/0433/6254/9910/files/nominal_ordinal_interval_and_ratio_scale.pdf
    • https://cdn.shopify.com/s/files/1/0440/7299/2918/files/fuzesaremepiteb.pdf
    • https://cdn.shopify.com/s/files/1/0437/0307/4984/files/google_chromium_free_for_ubuntu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9857/8848/files/88911579428.pdf
    • https://cdn.shopify.com/s/files/1/0431/6263/2360/files/rapagojiwabusuxajexiwi.pdf
    • https://cdn.shopify.com/s/files/1/0438/9873/2696/files/antimicrobial_activity_of_honey.pdf
    • https://cdn.shopify.com/s/files/1/0435/6331/9445/files/avancemos_2_practice_workbook_answers.pdf
    • https://cdn.shopify.com/s/files/1/0438/2287/4781/files/libro_administracion_de_recursos_humanos_arias_galicia.pdf
    • https://cdn.shopify.com/s/files/1/0431/2550/6208/files/vawus.pdf
    • https://cdn.shopify.com/s/files/1/0433/2758/6457/files/ap_sachivalayam_notification_2020.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_off0000660c.bin
9a40b324793d2e1433aebad47d3dfdfa3f92e9cefd2357464a4c70ca2c7f976d
pdf-font-stream PDF embedded font (sfnt) at offset 0x660C 5360 bytes
font_01_sfnt_off00007830.bin
9e877d3898c614c87d09097def1e5216d632427721711ab0e3b8c0501d8713ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x7830 10120 bytes