Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6be4e39f10e8a4e…

MALICIOUS

PDF

34.6 KB Created: 2020-08-01 10:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35a484276aa56edeab52ca794f3c3836 SHA-1: 8e363738dabb732b300e4420cadfafb3a958da7a SHA-256: f6be4e39f10e8a4e525df333691cc0771eb1878db556313975ced0cee5d38503
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=cartooning+the+head+and+figure+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same malicious URL and several benign-looking Shopify URLs, suggesting a lure to a malicious site disguised as a document.

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=cartooning+the+head+and+figure+pdf
    • http://files.jessicagardnerdance.com/uploads/1/3/1/4/131438142/629cc84319381.pdf
    • http://files.azzydoon.com/uploads/1/3/1/4/131438844/mizeberejaz.pdf
    • http://files.silverwearbyjason.com/uploads/1/3/2/6/132680908/60c9eb949.pdf
    • https://cdn.shopify.com/s/files/1/0432/9160/7190/files/95084864154.pdf
    • https://cdn.shopify.com/s/files/1/0432/0886/8008/files/45469628162.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7345/files/fedafaselawape.pdf
    • https://cdn.shopify.com/s/files/1/0428/2348/3548/files/47501562647.pdf
    • https://cdn.shopify.com/s/files/1/0432/8436/5468/files/dibovodi.pdf
    • https://cdn.shopify.com/s/files/1/0430/5528/4373/files/lalezikezakukafemejemetad.pdf
    • https://cdn.shopify.com/s/files/1/0431/5286/7494/files/wikowofanibiwak.pdf
    • https://cdn.shopify.com/s/files/1/0430/9801/3845/files/32180258872.pdf
    • https://cdn.shopify.com/s/files/1/0430/6065/8333/files/63189408368.pdf
    • https://cdn.shopify.com/s/files/1/0435/0512/3493/files/mewinawiduvujovevomomiv.pdf
    • https://cdn.shopify.com/s/files/1/0431/4529/8074/files/molexifoxe.pdf
    • https://cdn.shopify.com/s/files/1/0432/1099/7921/files/38939067130.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8867/files/16147392792.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_off00004b23.bin
d220dcecce16384f61e2da6edda66df69241b494c653b247737f6a600b1ff487
pdf-font-stream PDF embedded font (sfnt) at offset 0x4B23 5000 bytes
font_01_sfnt_off00005c1c.bin
b5808a568b10f96b26949d93ecf819e8fdacc2fc3c20e4ca44d6277800222ee2
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C1C 9948 bytes