Malicious PDF — malware analysis report

Static analysis result for SHA-256 684b75daec8e81c0…

MALICIOUS

PDF

48.9 KB Created: 2020-08-30 17:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19a7778c2159448870b062fc8dbcd446 SHA-1: a76db6955675d52734f2316e00497a6a9e7c9253 SHA-256: 684b75daec8e81c0e967798eb474e4cd301d39893fd09dd11da2447e2ddf2f36
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 a link farm designed to redirect users to potentially malicious content. One critical heuristic identified a direct link to known malicious redirector infrastructure. While no scripts were extracted, the PDF structure itself facilitates the redirection, suggesting an attempt to lure users to external sites for further exploitation.

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/wix?keyword=terraria+calamity+mod+summoner+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/1531/3307/files/63568237973.pdf
    • https://cdn.shopify.com/s/files/1/0434/0023/3112/files/velakimar.pdf
    • https://cdn.shopify.com/s/files/1/0434/9237/6741/files/wipifij.pdf
    • https://static.usrfiles.com/ugd/ea78e0_8d5d33aa8bb546e4b354b227aa94088a.pdf
    • https://static.usrfiles.com/ugd/b8c837_c7cd55585e554314b7a15843aa122d0f.pdf
    • https://static.usrfiles.com/ugd/b8c837_a0d82b7feba8453fa124bdc4322fb0ca.pdf
    • https://static.usrfiles.com/ugd/22bf55_a4763a20a8f748bbb2032e2667e371db.pdf
    • https://cdn.shopify.com/s/files/1/0430/8379/2548/files/56233616238.pdf
    • https://cdn.shopify.com/s/files/1/0428/6673/7311/files/regineziduluvajamupadit.pdf
    • https://cdn.shopify.com/s/files/1/0431/9546/5892/files/15_ml_de_aceite_a_gramos.pdf
    • https://cdn.shopify.com/s/files/1/0433/9610/4341/files/dusaxote.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/76052218599.pdf
    • https://cdn.shopify.com/s/files/1/0436/0490/2045/files/napexokotunusukoxof.pdf
    • https://cdn.shopify.com/s/files/1/0437/5881/3333/files/sheet_metal_deep_drawing_calculations.pdf
    • https://cdn.shopify.com/s/files/1/0437/9302/3133/files/pandora_bracelet_size_guide_in_inches.pdf
    • https://cdn.shopify.com/s/files/1/0433/3636/8296/files/tachibana_san27s_circumstances_with_a_man.pdf
    • https://cdn.shopify.com/s/files/1/0431/6997/2384/files/change_management_framework.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_off0000827b.bin
2acaeff691444ed4c166a31c05a445b4a20af5cf30e7af1a910a32188bdc2aa7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x827B 5308 bytes
font_01_sfnt_off00009478.bin
0ee08227cc67ff706cd8c849e225d263bac244c96e46439785a2df15c2fd303a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9478 9996 bytes

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