Malicious PDF — malware analysis report

Static analysis result for SHA-256 0728f850535185b5…

MALICIOUS

PDF

43.1 KB Created: 2020-09-05 15:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d9cc224019871d5fa0f9b52591596e4 SHA-1: 3cbb8510d1d8950fc001c2ea7f3c3e9558382c9c SHA-256: 0728f850535185b597a4572c6d962527a3a667a8d4dc5ec20e8cbbc68a622915
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text that suggests it is a 'data sheet' lure. The presence of numerous external PDF links further indicates a link farm or redirection strategy. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.link/pify?keyword=bg+fireline+board+data+sheet
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/7447/7473/files/34211286665.pdf
    • https://cdn.shopify.com/s/files/1/0433/9128/7461/files/autocad_printer_missing.pdf
    • https://cdn.shopify.com/s/files/1/0432/8800/2710/files/57273891418.pdf
    • https://static.usrfiles.com/ugd/b8c837_08d055e20f954efa84331490402bc89e.pdf
    • https://static.usrfiles.com/ugd/fd30ac_9d4e8b609a0c446eb5f60670ebdb65f0.pdf
    • https://static.usrfiles.com/ugd/b8bbd7_f0be8613e65c4db2a3bb270a9882e2f9.pdf
    • https://static.usrfiles.com/ugd/a382ee_3700e2533ed84595bf693df65b99f36b.pdf
    • https://static.usrfiles.com/ugd/c162b3_1de2282e09b2443da02cd500666be03d.pdf
    • https://static.usrfiles.com/ugd/d9e9a0_7a8a809092ee4366a5014167cef9d2c8.pdf
    • https://static.usrfiles.com/ugd/2eedf1_51f06af4ca26439eb1c0ceb1cdf38461.pdf
    • https://cdn.shopify.com/s/files/1/0431/3346/8839/files/tinazujojanu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6487/6444/files/34423221020.pdf
    • https://cdn.shopify.com/s/files/1/0437/3915/2535/files/22_oxidation-_reduction_reactions_practice_problems_answers.pdf
    • https://cdn.shopify.com/s/files/1/0438/3460/5730/files/jurisprudence_exam_texas_lpc.pdf
    • https://cdn.shopify.com/s/files/1/0428/5802/1027/files/61385595252.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a11.bin
4b5d01e08b7f0d194dd7929d15219923ab764668d794cdea9068dcdad89ac68e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A11 5356 bytes
font_01_sfnt_off00007c46.bin
d7ab757ed7b4ae11efaf41b8487a6a0cf22b15095204d229ac27ecae36d4772a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C46 10544 bytes

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