Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4982833f06fcef6…

MALICIOUS

PDF

46.2 KB Created: 2020-08-20 10:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f72fe52a99a57ae2cb2998a98e419f49 SHA-1: 0fac5a278aadba12d563620085d08420b1d4146e SHA-256: d4982833f06fcef6d5a0829ea5f708efaf70089cbed9d189dda6c9922bf4de45
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high number of embedded links, many pointing to potentially malicious redirectors or SEO spam. The ML classifier also strongly indicated maliciousness. The document body contains a URL that appears to be part of the link farm, suggesting the primary purpose is to drive traffic to external sites.

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.ru/pify?keyword=photo+editor+blur+background+apk+online
    • http://rogoba.buttevistaparentclub.org/uploads/1/3/0/7/130776445/88424a5a849b8e1.pdf
    • http://files.angelteachings.com/uploads/1/3/0/7/130776368/nukugu.pdf
    • http://files.thecandyshopprints.com/uploads/1/3/0/7/130739419/wepok.pdf
    • http://files.motivationbymaia.com/uploads/1/3/2/6/132695405/31d9e66e71c1.pdf
    • http://files.michaelhower.com/uploads/1/3/1/8/131856247/povoxexevi.pdf
    • https://cdn.shopify.com/s/files/1/0435/2232/6680/files/speak_now_album_deluxe_edition_free.pdf
    • https://cdn.shopify.com/s/files/1/0427/8291/6767/files/88299721206.pdf
    • https://cdn.shopify.com/s/files/1/0440/1384/6693/files/21335697630.pdf
    • https://cdn.shopify.com/s/files/1/0431/1393/9110/files/the_substitute_failure_is_not_an_option.pdf
    • https://cdn.shopify.com/s/files/1/0431/6617/1297/files/list_of_verbs_nouns_adjectives_and_adverbs.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/libro_el_cerebro_del_nio_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0432/9409/7576/files/kalphite_king_solo_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78476378890.pdf
    • https://cdn.shopify.com/s/files/1/0430/0413/3525/files/63351901838.pdf
    • https://cdn.shopify.com/s/files/1/0430/9028/0609/files/mathematical_models_and_methods_in_applied_sciences.pdf
    • https://cdn.shopify.com/s/files/1/0433/3853/0965/files/pdf_algorithme_de_tri.pdf
    • https://cdn.shopify.com/s/files/1/0432/7125/8278/files/aquarium_definition.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071dc.bin
912791a114cb8d10eba3b9236bb4362205bb7c3a277224b761934ab0560f6f6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71DC 5364 bytes
font_01_sfnt_off0000840c.bin
ee2dafd8fbfe630792dcde05e0caf9b4c0254bd99b9a45f63816c5dcf77ade32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x840C 11920 bytes

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