Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8af75e03d3a9035…

MALICIOUS

PDF

39.5 KB Created: 2020-08-20 22:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ced9859ddfc527c6d7b4ce8d70a799ef SHA-1: 391b879b3a93803f556849043d4603a9dfcfe926 SHA-256: e8af75e03d3a903579eb1e66ff1f63f398cca7871cb28ba285ce059fdac42275
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to manipulate search engine results and drive traffic to malicious sites. The ML classifier strongly indicates malicious intent.

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=barcode+font+for+ms+access
    • http://files.gcontrols.com/uploads/1/3/1/8/131871721/2495933.pdf
    • http://tesabesot.sassypineappleshop.com/uploads/1/3/1/3/131383482/zosasewukepi.pdf
    • http://files.pokornychiropracticclinicsd.com/uploads/1/3/1/6/131636746/toletumarilalen-goraxewo.pdf
    • http://files.cybercentreforenglish.com/uploads/1/3/1/3/131381985/d2ad64cde78.pdf
    • http://tadinoli.aranrosedesigns.com/uploads/1/3/1/4/131406687/0630a4cbf81.pdf
    • https://cdn.shopify.com/s/files/1/0433/6956/2266/files/list_of_asian_countries_and_capitals.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2623/files/2714968596.pdf
    • https://cdn.shopify.com/s/files/1/0429/9299/2410/files/14664024624.pdf
    • https://cdn.shopify.com/s/files/1/0434/5944/4896/files/cambridge_certificate_of_proficiency_in_english_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31056735454.pdf
    • https://cdn.shopify.com/s/files/1/0429/6274/7548/files/fugabomabaxu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6836/6760/files/jaxarun.pdf
    • https://cdn.shopify.com/s/files/1/0436/6227/8809/files/test_gramatyczny_angielski_b1.pdf
    • https://cdn.shopify.com/s/files/1/0431/3694/2234/files/31162543543.pdf
    • https://cdn.shopify.com/s/files/1/0437/2863/4010/files/kivoxexef.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_off00005d87.bin
aa24236a60071afc299b8e383fa7faa0d7f85687efdbe7e565fb7f1b07142792
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D87 5184 bytes
font_01_sfnt_off00006f07.bin
3c5c76acc059fcaa4c16f6c8e199f728780d7475278cdc9f33df108879f19665
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F07 9968 bytes