Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eedfce3edd9e125…

MALICIOUS

PDF

45.3 KB Created: 2020-07-26 07:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12dbbc6e687a8714b32d7696c2582469 SHA-1: 29adec107fda6d0f20b8a46eb6e68ce32cef221e SHA-256: 4eedfce3edd9e1258b837eff29ab534a9d446b08ff7f1e9dca5f1bae830c20b2
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a high number of embedded links, with at least one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs. The primary attack pattern involves luring users to malicious sites via these links.

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=bcso+on+child+support+worksheet
    • http://files.prestigiouspaw.com/uploads/1/3/0/8/130874489/nexekuwuk.pdf
    • http://files.ncrehabassociation.org/uploads/1/3/1/6/131606121/lixinagigu-pelezeraxuwo-totabitigid.pdf
    • http://files.servingwithjoyhealer.com/uploads/1/3/1/4/131409385/palegelipanoti-wipimolasol.pdf
    • http://files.kdvp.org/uploads/1/3/1/4/131437246/ribozananaj-pikoxorudokiv-jajigez.pdf
    • http://files.ncrehabassociation.org/uploads/1/3/1/6/
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/20011772627.pdf
    • https://cdn.shopify.com/s/files/1/0428/8197/4435/files/63768270814.pdf
    • https://cdn.shopify.com/s/files/1/0438/4597/6224/files/20465296997.pdf
    • https://cdn.shopify.com/s/files/1/0430/1747/0101/files/ratusetuxonegenigigajiz.pdf
    • https://cdn.shopify.com/s/files/1/0430/3526/3138/files/kixivivudevikigereg.pdf
    • https://cdn.shopify.com/s/files/1/0437/6467/8807/files/fofojuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/0569/7438/files/mavurapusa.pdf
    • https://cdn.shopify.com/s/files/1/0433/1595/3817/files/vunaxuvolesejemafabofulef.pdf
    • https://cdn.shopify.com/s/files/1/0431/8494/7357/files/delove.pdf
    • https://cdn.shopify.com/s/files/1/0437/3217/2965/files/42296246059.pdf
    • https://cdn.shopify.com/s/files/1/0428/8475/9711/files/xedopakunetenupedodine.pdf
    • https://cdn.shopify.com/s/files/1/0428/3393/6547/files/31930986102.pdf
    • https://cdn.shopify.com/s/files/1/0434/8795/3053/files/189269026.pdf
    • https://cdn.shopify.com/s/files/1/0434/8713/3860/files/97404050858.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_off000072cf.bin
9b9104a9457b2664c509c7ce935f04dce33de8054cb1ca28c84f29351a72cf4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72CF 5040 bytes
font_01_sfnt_off000083f1.bin
80743a4010279e332cf7fe2b2aabe842c043986cc68f8ea1bac8347e92f13d1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83F1 10532 bytes

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