Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6f2433b39911120…

MALICIOUS

PDF

41.1 KB Created: 2020-08-21 12:40:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c0d295ae728dc3e9d30bb4685227f74 SHA-1: d5cf5d9185fa4b2a777e44ece47d37b7062af06f SHA-256: d6f2433b3991112085a2e8d3eb0735fc2f20653034b9445e00abec69bb4584a0
154 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary link to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'course planner excel template' and the malicious URL. The ML classifier strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or exploits.

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=course+planner+excel+template
    • http://kiwez.got-a-man.com/uploads/1/3/2/7/132740763/gususijagijaxig.pdf
    • http://fogikepav.meredithrotary.com/uploads/1/3/1/3/131383839/8b3e649c.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/mazaxazukomuguwe.pdf
    • https://cdn.shopify.com/s/files/1/0429/1241/5911/files/tivakefazugezavega.pdf
    • https://cdn.shopify.com/s/files/1/0432/5546/4104/files/berekafanuw.pdf
    • https://cdn.shopify.com/s/files/1/0449/9865/6158/files/rizosoxoluxosituvezide.pdf
    • https://cdn.shopify.com/s/files/1/0434/4561/6792/files/mataji_aarti_video.pdf
    • https://cdn.shopify.com/s/files/1/0433/1628/1512/files/78729259133.pdf
    • https://cdn.shopify.com/s/files/1/0440/2230/0822/files/relationship_marketing_thesis.pdf
    • https://cdn.shopify.com/s/files/1/0433/2696/3865/files/how_to_download_google_drive.pdf
    • https://cdn.shopify.com/s/files/1/0433/9227/0494/files/40616053562.pdf
    • https://cdn.shopify.com/s/files/1/0436/8020/2905/files/23558484763.pdf
    • https://cdn.shopify.com/s/files/1/0432/1817/4107/files/zozojijam.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_off00006537.bin
45f3409f3330407518d771c3de9a021fb9ac1d95626b98735a1e98ddbed8b73d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6537 5052 bytes
font_01_sfnt_off0000764f.bin
f6f04b1001cb21950813c7ffb6c6a4b23eecc3d0c4f56a90c3943d806b3e169c
pdf-font-stream PDF embedded font (sfnt) at offset 0x764F 9784 bytes