Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd1ed18f59b9947e…

MALICIOUS

PDF

41.8 KB Created: 2020-08-30 13:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37e456011286f4522a6cf295bf6c83a0 SHA-1: 9c24b22c997663611d99471f86e9c6aadf1c90fb SHA-256: dd1ed18f59b9947e58e9f50c9847944c2d3aa81957d59dcaeab481015e556c4b
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as legitimate documents, but the primary link redirects to a known malicious redirector. The ML classifier strongly indicated maliciousness. The document body text is garbled, but the presence of the malicious URL and the link farm heuristics confirm the intent to redirect users to harmful content.

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.cc/wix?keyword=help+for+billy+pdf
    • https://static.usrfiles.com/ugd/b8c837_abe6bba0a8304adcb885ee555a61a8ab.pdf
    • https://static.usrfiles.com/ugd/b8c837_7fae5cbdc5d6457eb89f4b3720b79149.pdf
    • https://static.usrfiles.com/ugd/353d00_e85b8ad33cd547d596bed478742fe126.pdf
    • https://static.usrfiles.com/ugd/cac9e4_a0803f0d4e7149fc8695e91dcdbe1efc.pdf
    • https://static.usrfiles.com/ugd/b8c837_3662aec4e0c945e5b011eba02bae30d8.pdf
    • https://static.usrfiles.com/ugd/b8c837_7155f7c6b781428d89e675d6822e7004.pdf
    • https://static.usrfiles.com/ugd/122077_13f60706ad164b13bc8bb269c85dfd14.pdf
    • https://cdn.shopify.com/s/files/1/0437/8374/9789/files/duke_nukem_forever_graphics_mods.pdf
    • https://cdn.shopify.com/s/files/1/0432/5860/9819/files/adverbs_worksheet_for_class_3.pdf
    • https://cdn.shopify.com/s/files/1/0435/5407/8871/files/6192007421.pdf
    • https://cdn.shopify.com/s/files/1/0430/9575/2864/files/fedomutadole.pdf
    • https://cdn.shopify.com/s/files/1/0440/7482/7941/files/peparogonemabajewabimu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8282/5382/files/lumejimaluge.pdf
    • https://cdn.shopify.com/s/files/1/0434/2641/4743/files/situlowabetelotamam.pdf
    • https://cdn.shopify.com/s/files/1/0429/1038/4295/files/49363440529.pdf
    • https://cdn.shopify.com/s/files/1/0433/0556/6366/files/zasexosafofovebarizot.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_off000067bf.bin
9f81f4c865d940bfe57f8bdf7dc53a5acb2b1c5356498439775d551517619d6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x67BF 4848 bytes
font_01_sfnt_off00007850.bin
b3145d3f2ca7079315bc9068d22dba123936a9cedf83af26be8fd36383cbecdf
pdf-font-stream PDF embedded font (sfnt) at offset 0x7850 10072 bytes