Malicious PDF — malware analysis report

Static analysis result for SHA-256 613747b4e43f7cbb…

MALICIOUS

PDF

40.3 KB Created: 2020-08-28 14:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e7ee7ef09ef766c1aa666a03433a70b SHA-1: 9643fb224cc38ecc2a1227024812a74e41e619af SHA-256: 613747b4e43f7cbbc26e4ba3604bfe130163c96ab8a3b9a42c92850d2a1e2686
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL, 'https://ttraff.link/pify?keyword=weekly+time+sheets+to+print', is presented as a lure for printing time sheets. The document body, though heavily obfuscated, also contains this URL. The ML classifier strongly indicated maliciousness, supporting the assessment of a phishing or redirection attack.

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/pify?keyword=weekly+time+sheets+to+print
    • http://sojos.coppertopbbq.com/uploads/1/3/0/7/130775934/c1c872eb.pdf
    • http://jedelev.littleandjuniormissbutler.org/uploads/1/3/1/6/131637814/jukasuvoxidud.pdf
    • http://files.cowgirlprose.com/uploads/1/3/1/6/131607635/rumugu.pdf
    • http://gegegi.tackleproducts.co.nz/uploads/1/3/2/6/132683097/551d27f30641.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/7105/2703/files/74014731881.pdf
    • https://cdn.shopify.com/s/files/1/0428/2066/5510/files/79324707999.pdf
    • https://cdn.shopify.com/s/files/1/0431/6980/8548/files/40685070435.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8360/files/clinical_examination_essentials_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/0892/5600/files/xujaluzezuso.pdf
    • https://cdn.shopify.com/s/files/1/0429/7146/3831/files/69660816922.pdf
    • https://cdn.shopify.com/s/files/1/0431/5417/8216/files/kosadefeviwikipusegigera.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0078/files/cuneiform_definition_in_your_own_words.pdf
    • https://cdn.shopify.com/s/files/1/0441/0081/2952/files/cefalohematoma_vs_caput_succedaneum.pdf
    • https://cdn.shopify.com/s/files/1/0433/9197/5580/files/kovatebepopufa.pdf
    • https://cdn.shopify.com/s/files/1/0431/2452/3159/files/fapamonavovuruzejotokek.pdf
    • https://cdn.shopify.com/s/files/1/0431/4857/4886/files/warhammer_bestiariusz_download.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_off000060f2.bin
dd8c579e6e61cd7c109266d8dc95d80dd4ac66632b5edfd6fab101bb6495b411		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60F2 5028 bytes
font_01_sfnt_off00007201.bin
f8ec15f58a36e27394f10bc51386bd0c466e7930630f65878b36527c18f62a43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7201 9980 bytes

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