Malicious PDF — malware analysis report

Static analysis result for SHA-256 28073ea76d521f16…

MALICIOUS

PDF

68.1 KB Created: 2020-08-30 02:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3e32cae49154d897b39705983cca22c SHA-1: 2c22e595f1949daa4c887d56f4f2a8f97e33cd0e SHA-256: 28073ea76d521f167b4892c5d881f024db024ce65c5c1c86d550fe5b2ccdcb86
154 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a technique often used in SEO poisoning or to redirect users to malicious sites. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a link to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the suspicious URL, suggesting an attempt to disguise the malicious intent.

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.link/wix?keyword=degree+of+saturation+soil+mechanics
    • https://static.usrfiles.com/ugd/b8c837_e810887798344cc2be36d688afd827bc.pdf
    • https://static.usrfiles.com/ugd/b8c837_725fe377594c4bc2a1c6cf20a1e3f041.pdf
    • https://static.usrfiles.com/ugd/74c34a_d4caf0bd76bc4658825b25f03616db12.pdf
    • https://static.usrfiles.com/ugd/b8c837_0c48052946144b0ab0da24408f636f6e.pdf
    • https://cdn.shopify.com/s/files/1/0439/6512/0670/files/enlace_polar.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9535/files/call_recording_app_uptodown.pdf
    • https://cdn.shopify.com/s/files/1/0427/4782/2236/files/undang_undang_apbn_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/24501063531.pdf
    • https://static.usrfiles.com/ugd/b8c837_82dbe24541994cccb731040fab8ba8dc.pdf
    • https://static.usrfiles.com/ugd/b8c837_c6162e7ae99f4d2786f0eabd5d9605a5.pdf
    • https://static.usrfiles.com/ugd/83e24f_cc398f6b3bf84743b052541a5201a090.pdf
    • https://static.usrfiles.com/ugd/5b9a87_c515e442e6ed45e588b82f1c50bd5d9d.pdf
    • https://static.usrfiles.com/ugd/b8c837_af90e20f444e4385837840cf9242fc11.pdf
    • https://cdn.shopify.com/s/files/1/0430/2995/4721/files/gigen.pdf
    • https://cdn.shopify.com/s/files/1/0431/3802/3592/files/vusikifabopilones.pdf
    • https://cdn.shopify.com/s/files/1/0433/9027/1638/files/wodisawawowax.pdf
    • https://cdn.shopify.com/s/files/1/0431/0079/9140/files/cardinalist_approach.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a029.bin
500d61b2d1de910eaf01f8df5f9b6425b26937afdca446cc7b5a118b62e12046		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA029 5292 bytes
font_01_sfnt_off0000b203.bin
508a48c30e1c783fe9198ab3c953a2a58427d4ed4ab1b5b9b3f1e930a0df8e27		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB203 13868 bytes
font_02_sfnt_off0000de4f.bin
ad46d1036f622594f40f59e3a408316b28551a713c84f5ab83903bbbde860e1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4F 20484 bytes

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