Malicious PDF — malware analysis report

Static analysis result for SHA-256 692ac085950ffbff…

MALICIOUS

PDF

41.9 KB Created: 2020-08-16 18:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6468b2f71cb3738d9afbc2d88ca86cb SHA-1: a895510b48a9b969864422581cb3a0ec53678538 SHA-256: 692ac085950ffbff4adf46697f05e9f9b83ab43018adc0a14f9012aae8eb81a1
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, including a known malicious redirector. The document body, though partially corrupted, suggests a lure related to a 'Ring doorbell pro install guide'. The presence of numerous PDF links, many pointing to Shopify domains, indicates a link farm strategy, likely to obscure the malicious redirector. The ML classifier strongly flagged this PDF as malicious.

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=ring+doorbell+pro+install+guide
    • http://nunazule.womensmarchroanoke.com/uploads/1/3/1/8/131872225/repiko-tiwelamamuxe-dufazasus-wapeko.pdf
    • http://files.professionalcapitalpartners.com/uploads/1/3/1/4/131438766/4121815.pdf
    • http://files.medelbergstravelservices.com/uploads/1/3/0/8/130813988/b0881c2382.pdf
    • http://guxaw.netliveseminars.org/uploads/1/3/0/7/130775350/lisusosimujog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/brain_fog_fix_mike_dow.pdf
    • https://cdn.shopify.com/s/files/1/0432/2036/9567/files/78646996456.pdf
    • https://cdn.shopify.com/s/files/1/0430/6750/6849/files/59149402342.pdf
    • https://cdn.shopify.com/s/files/1/0429/2391/7478/files/wavozix.pdf
    • https://cdn.shopify.com/s/files/1/0433/5498/0505/files/68209953919.pdf
    • https://cdn.shopify.com/s/files/1/0440/5451/1766/files/membrane_transport_concept_map_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0430/4509/3533/files/free_virology_books.pdf
    • https://cdn.shopify.com/s/files/1/0446/2955/7411/files/john_deere_4230_for_sale.pdf
    • https://cdn.shopify.com/s/files/1/0429/8558/6849/files/68165993005.pdf
    • https://cdn.shopify.com/s/files/1/0428/5700/5215/files/tapikomuxinoxurije.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/pujat.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90262961418.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8360/files/35577736892.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_off0000629f.bin
0bebb25d6548b7151375c3df7e5bb891d826046c3818b4e8ea953699bcc12a24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x629F 5276 bytes
font_01_sfnt_off00007491.bin
284bcb9aded4a7f41a8ac728ddd68357d09dafe8aa23332d4b004e404395cdae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7491 11916 bytes

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