Malicious PDF — malware analysis report

Static analysis result for SHA-256 c873862e39ca53ba…

MALICIOUS

PDF

41.3 KB Created: 2020-08-23 03:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08531e1c1b6c1a4a9daef0419de03109 SHA-1: 9ffa22c52ac01e2d567b2e570210ba85824d2dcc SHA-256: c873862e39ca53ba26495abe5025fdc60fed4c45e5a248e17daa3bf60538d81d
152 Risk Score

Malware Insights

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

The PDF contains a prominent link to 'ttraff.com', identified as a malicious redirector. The document body, though heavily obfuscated, contains the same URL and a list of other URLs, many hosted on Shopify, suggesting a link farm or redirection strategy. The ML classifier strongly flagged this PDF as malicious, and the presence of a malicious redirector URL indicates an attempt to lead the user to a harmful site, likely for further exploitation or credential harvesting.

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.com/pify?keyword=most+confusing+riddles+with+answers
    • http://fomanajaf.coreducate.com/uploads/1/3/1/4/131454526/zadulexim.pdf
    • https://cdn.shopify.com/s/files/1/0439/2789/6219/files/morisiterawima.pdf
    • https://cdn.shopify.com/s/files/1/0438/4836/8288/files/canadian_multilingual_standard_keyboard.pdf
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/38852256403.pdf
    • https://cdn.shopify.com/s/files/1/0428/9809/6284/files/cement_manufacturing_process_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/9369/5391/files/zifikasuwurumezin.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8311/files/list_of_foods_to_avoid_with_acid_reflux.pdf
    • https://cdn.shopify.com/s/files/1/0434/6095/2229/files/38348965625.pdf
    • https://cdn.shopify.com/s/files/1/0435/6443/3566/files/xolupegixavojawikige.pdf
    • https://cdn.shopify.com/s/files/1/0434/6219/7400/files/organizational_change_management_process.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5816/files/guweniribaramalonobut.pdf
    • https://cdn.shopify.com/s/files/1/0428/4098/1660/files/kasarad.pdf
    • https://cdn.shopify.com/s/files/1/0440/5601/9109/files/23938799198.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_off000063cf.bin
822d38722b092070b997e42477783169ad8762e68f98b096c4f71a9fddb67a60
pdf-font-stream PDF embedded font (sfnt) at offset 0x63CF 5380 bytes
font_01_sfnt_off0000762a.bin
2f6a6b377236557031b6ead77a908403c17641f3a4d736fef9d426713aa106bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x762A 10044 bytes