Malicious PDF — malware analysis report

Static analysis result for SHA-256 a75787467f6244e3…

MALICIOUS

PDF

47.5 KB Created: 2020-08-04 21:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e901b0fea6bf55079f5b7d644066253 SHA-1: 94699bf89793f7de2eab0c2658d05793333aef3b SHA-256: a75787467f6244e32b21fe5eb1ee0d3171804cb54fe1afcce85fac0d9070ff33
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous links, including one pointing to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to 'Health benefits of orange fleshed sweet potato pdf' and includes the malicious URL, suggesting a lure to a malicious site. The presence of multiple Shopify URLs, some benign and some unknown, indicates a potential link farm strategy. The ML classifier strongly flagged this PDF as malicious.

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/wb?keyword=health%20benefits%20of%20orange%20fleshed%20sweet%20potato%20pdf
    • http://files.caregiverinspirations.com/uploads/1/3/1/3/131381706/sukemuseb_fozax_sapizosupub_bosiw.pdf
    • http://rijube.nanakoclothes.com/uploads/1/3/0/7/130776158/7237106.pdf
    • http://navazi.backtobal.com/uploads/1/3/1/8/131858661/1346080.pdf
    • http://files.houstonbottledwater.com/uploads/1/3/0/9/130968950/pawipimig-vegiv-sukok-selalix.pdf
    • https://cdn.shopify.com/s/files/1/0435/4405/1864/files/78438388840.pdf
    • https://cdn.shopify.com/s/files/1/0437/7555/7793/files/kixezikugeto.pdf
    • https://cdn.shopify.com/s/files/1/0427/9340/2534/files/63191737493.pdf
    • https://cdn.shopify.com/s/files/1/0430/4656/8098/files/teratozadili.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/70278744099.pdf
    • https://cdn.shopify.com/s/files/1/0434/0203/5351/files/gagajafadomolizodiwume.pdf
    • https://cdn.shopify.com/s/files/1/0427/7728/0671/files/63993806766.pdf
    • https://cdn.shopify.com/s/files/1/0430/5554/6517/files/kubugebumuvorogis.pdf
    • https://cdn.shopify.com/s/files/1/0427/7462/6470/files/tipowikagikijotofaruzu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46946939033.pdf
    • https://cdn.shopify.com/s/files/1/0437/5196/4830/files/muvasusafako.pdf
    • https://cdn.shopify.com/s/files/1/0430/7661/6341/files/3ds_max_tutorials_for_beginners_architecture.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3750/files/86257545310.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_off00007c3f.bin
d55b4afd5b5c0b1a0a1e8587a902db15da54b48cf61aaa387dd0d66c3e4c5fe7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C3F 5496 bytes
font_01_sfnt_off00008eef.bin
ccd1ab337c1a332929d9e543d5d50cfe1362ef02447b40848294cec6305d8e4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EEF 9796 bytes

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