Malicious PDF — malware analysis report

Static analysis result for SHA-256 b50ff7adbeeeb8cc…

MALICIOUS

PDF

48.1 KB Created: 2020-08-17 03:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1478b288cf2d1a38d14779f93cbdf327 SHA-1: ff0e61bdae3cae5112c68ccfc9a6124aae1d011f SHA-256: b50ff7adbeeeb8cc405bd188c75fe0ba08734ba72fd0950cf9982ad9e3d1c177
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link

The PDF file contains a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final destination of the malicious payload. The document body, though heavily obfuscated, contains the same URL, suggesting it is the primary lure. The presence of numerous other PDF links, many pointing to benign content on Shopify, indicates a link farm or SEO poisoning tactic to increase the visibility of the malicious link. The ML classifier 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.cc/pify?keyword=tecnologias+de+la+informacion+carrera+ecuador
    • http://sovejol.journeybackancestry.com/uploads/1/3/1/3/131379874/0e78fa6d.pdf
    • http://zekirataz.woodstockvolleyball.com/uploads/1/3/0/7/130775164/sagiwegoka.pdf
    • http://files.centralpolicestation.org/uploads/1/3/1/4/131437538/bolitanafediwivupo.pdf
    • https://cdn.shopify.com/s/files/1/0450/0642/2184/files/video_killed_the_radio_star_piano.pdf
    • https://cdn.shopify.com/s/files/1/0435/9713/6030/files/possessive_apostrophe_s_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0432/3124/8539/files/88404907832.pdf
    • https://cdn.shopify.com/s/files/1/0430/9254/1589/files/safety_management_system_download.pdf
    • https://cdn.shopify.com/s/files/1/0444/2914/8327/files/rumovusemuxekajatezekarip.pdf
    • https://cdn.shopify.com/s/files/1/0430/6858/8194/files/etapas_enfermedad_alzheimer.pdf
    • https://cdn.shopify.com/s/files/1/0437/5959/9765/files/51575487268.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96672573922.pdf
    • https://cdn.shopify.com/s/files/1/0430/1655/2605/files/filavepifijigusawige.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mobisibat.pdf
    • https://cdn.shopify.com/s/files/1/0437/6431/8359/files/squinty_eyes_emoji.pdf
    • https://cdn.shopify.com/s/files/1/0428/6667/1782/files/gewodibokamigudax.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_off00007982.bin
6251d17ac2f87bcb8927a42aa20ce6a383cd05b45a57f5f6f38a3016a6ceae8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7982 5288 bytes
font_01_sfnt_off00008b60.bin
eca4889fe613c4a3b2279d03a1948fab5d4464c52c107938ad28461d7cbb21d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B60 11852 bytes