Malicious PDF — malware analysis report

Static analysis result for SHA-256 869500ba85dbe64c…

MALICIOUS

PDF

49.6 KB Created: 2020-08-31 14:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa5964fcb178a0babab9a1019531a8e4 SHA-1: ba685bbac96ac3319732ce2792015eeb7036aed2 SHA-256: 869500ba85dbe64ca7206fa34534f3a4289b794bab0aff6fb0ad3233f2a5e807
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged as malicious by a machine learning classifier and contains a link farm with 30 external PDF links, one of which points to a known malicious redirector. The document body contains garbled text but also includes the malicious URL and several other benign URLs, suggesting an attempt to disguise malicious activity within a large number of links. The primary malicious indicator is the PDF_MALICIOUS_REDIRECTOR_LINK heuristic.

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=zinc+aluminum+corrugated+roofing+sheets
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/c162b3_482854e1ff4644d5aaa6e10b02a21743.pdf
    • https://static.usrfiles.com/ugd/97368a_09d2bdea518b46ce96ac94af4a6d3cc4.pdf
    • https://static.usrfiles.com/ugd/b8c837_9103ccc0c81647c68040e4b2ae5c9f27.pdf
    • https://cdn.shopify.com/s/files/1/0431/2973/3282/files/satoxenabojumemusuxiwuwes.pdf
    • https://cdn.shopify.com/s/files/1/0434/7707/4086/files/35312318935.pdf
    • https://cdn.shopify.com/s/files/1/0431/8448/8607/files/el_nuevo_compaero_de_cuarto.pdf
    • https://cdn.shopify.com/s/files/1/0428/8885/5718/files/39517791486.pdf
    • https://cdn.shopify.com/s/files/1/0433/8080/1701/files/juganoxig.pdf
    • https://cdn.shopify.com/s/files/1/0440/0631/0046/files/dujarux.pdf
    • https://cdn.shopify.com/s/files/1/0448/9589/5707/files/52365478653.pdf
    • https://cdn.shopify.com/s/files/1/0431/2432/6564/files/tiwapijejet.pdf
    • https://static.usrfiles.com/ugd/e2b09b_a1d92660f3e34c868fa2dbf3fa11db74.pdf
    • https://static.usrfiles.com/ugd/7e0eb0_93c187be1fc54a0d859581844f6c4902.pdf
    • https://static.usrfiles.com/ugd/136d07_7b63e083c6b547acaf3695971e3e1c47.pdf
    • https://static.usrfiles.com/ugd/60933b_77c091c834f44e2ab0cd73bc9f3d96ec.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b01.bin
47d168bf277db7c6def2e51d1e731fbb811200b36d452c28a50f6bca16aad246		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B01 5272 bytes
font_01_sfnt_off00007cb3.bin
f0f9780c5e40f54a5b2e626e04dfc3758b8077eb918b996207113ddb9048a69f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CB3 15008 bytes
font_02_sfnt_off0000ab67.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB67 4324 bytes

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