Malicious PDF — malware analysis report

Static analysis result for SHA-256 4febbf4d746e5ae2…

MALICIOUS

PDF

48.2 KB Created: 2020-08-09 22:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3430d08ad6947c8086b20bb9c0ed2f8d SHA-1: 031af1d6b9e1c1788c76625b055882b558c02eb3 SHA-256: 4febbf4d746e5ae2034e90ea1c664e06721fe231723c2bce0c938f55a3c8b5bb
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'Alzheimer pdf' and a URL that appears to be part of an SEO poisoning or link farm strategy. The presence of many links, including one pointing to a redirector, suggests a malicious intent to lure users to potentially harmful sites.

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=alzheimer+pdf+t%25C3%25BCrk%25C3%25A7e
    • http://files.185686508.com/uploads/1/3/0/9/130969146/wakoxifodol.pdf
    • http://files.ewdstone.com/uploads/1/3/1/6/131637409/xezuzidudex.pdf
    • http://files.tourdestreescanada.com/uploads/1/3/1/4/131406372/gaxemafajemugudop.pdf
    • https://cdn.shopify.com/s/files/1/0433/6176/3480/files/biochemistry_and_molecular_biology_of_plants_buchanan.pdf
    • https://cdn.shopify.com/s/files/1/0433/1628/1512/files/android_studio_keyboard_shortcuts.pdf
    • https://cdn.shopify.com/s/files/1/0431/1970/6279/files/rojigawipugipipufabid.pdf
    • https://cdn.shopify.com/s/files/1/0436/6244/2646/files/wovaxibudakuwudamusename.pdf
    • https://cdn.shopify.com/s/files/1/0431/8671/6830/files/anatomy_of_human_bones.pdf
    • https://cdn.shopify.com/s/files/1/0427/8065/5775/files/kerezikesuxudav.pdf
    • https://cdn.shopify.com/s/files/1/0441/4029/8392/files/body_dysmorphic_disorder_dsm_5.pdf
    • https://cdn.shopify.com/s/files/1/0435/4693/5451/files/pabipiwanolurem.pdf
    • https://cdn.shopify.com/s/files/1/0430/6527/8625/files/tutinabagudexoguritaboras.pdf
    • https://cdn.shopify.com/s/files/1/0437/3626/8949/files/77865260998.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/26225030347.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/9715790575.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_off00007be1.bin
466bca65a7a2e3bdf1c801e3ca22de8d4bccebbc7489d4672a88b0c094a64eb4
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BE1 5296 bytes
font_01_sfnt_off00008d95.bin
dc03f74c3304c19873d257ef4bf51f157f85e2f816021aae8db309c75b2be2c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D95 11928 bytes