Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c1a800ddbef50a…

MALICIOUS

PDF

42.8 KB Created: 2020-08-31 16:39:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09207e8514b5c04a634adf905e869e48 SHA-1: aabd01d2462349f74c22f92d3f947806cd15bdeb SHA-256: 28c1a800ddbef50ab75042ce88f277a7eac1410dbcf4c65f7aabb2352b7c8d2c
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a lure for an 'income statement template monthly'. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed 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/pify?keyword=income+statement+template+monthly
    • https://static.usrfiles.com/ugd/b8c837_d89f4c1daefa4a51ba6be8fbc032956c.pdf
    • https://static.usrfiles.com/ugd/fb5067_6838410a06a5456d981ac3d918605606.pdf
    • https://static.usrfiles.com/ugd/b8c837_f04ae1c858014f66b33eb8b762b268ec.pdf
    • https://static.usrfiles.com/ugd/0a593f_5bbaacbc02fe4290b905548fc108df99.pdf
    • https://static.usrfiles.com/ugd/b8c837_eea4112683c54a28bbe9606a482bf2ab.pdf
    • https://static.usrfiles.com/ugd/b8c837_48ef981763f14e7cb887befc3eb6581d.pdf
    • https://static.usrfiles.com/ugd/b8c837_3e75b790cbea4b9398d784f0834df93e.pdf
    • https://static.usrfiles.com/ugd/7198c1_a533d6b5d7024070813b02e3a6914cbc.pdf
    • https://static.usrfiles.com/ugd/b8c837_d2f364a5180b4aecae29aac87ddfbe16.pdf
    • https://static.usrfiles.com/ugd/a48928_8a10ba6aa75b429484d662a52ab6e352.pdf
    • https://cdn.shopify.com/s/files/1/0438/2710/1853/files/6002442953.pdf
    • https://cdn.shopify.com/s/files/1/0437/6811/9448/files/25011928224.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_off00006195.bin
e8e418fc65e99fb38f455b9e15799b25888f108e5b9bda48ef2b9c8f77edd68a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6195 5116 bytes
font_01_sfnt_off000072e1.bin
68a4ed8d3dc4d0393395b2c5fde138d307ab190980b7f1bd33c687df091dff24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72E1 13492 bytes

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