Malicious PDF — malware analysis report

Static analysis result for SHA-256 deb4e7f59145b41c…

MALICIOUS

PDF

45.7 KB Created: 2020-08-14 07:39:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fd5f976a4c73e12f0a31b40217d4736 SHA-1: ca4dcb0b0ba9242289c06e1543e1f163c10a5903 SHA-256: deb4e7f59145b41cb11b92c7c4bd6921e8abdfc2409066be3c8b8450ea1efaa7
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=safari+browser++free+for+windows+7', is designed to lure users with a fake software offer. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to various PDF files, some of which are hosted on potentially untrusted domains. The ML classifier strongly supports the malicious verdict.

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=safari+browser++free+for+windows+7
    • http://files.skywaterlabradors.com/uploads/1/3/1/3/131384113/8950631.pdf
    • http://files.missioncleaners.ca/uploads/1/3/0/8/130814466/34f8d76afeaf5.pdf
    • http://files.sweetnnaughty.ca/uploads/1/3/1/3/131384656/mowobot-sukijuxofunoput-bikerunuvud-nusapunu.pdf
    • http://popofo.inyourskivvies.com/uploads/1/3/1/6/131606289/bbebdf.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/68906731860.pdf
    • https://cdn.shopify.com/s/files/1/0435/5129/3603/files/schaum_s_calculus_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0437/6687/4266/files/bofizirasepasefunil.pdf
    • https://cdn.shopify.com/s/files/1/0434/9768/5157/files/40470485456.pdf
    • https://cdn.shopify.com/s/files/1/0437/1123/4197/files/wakakefipez.pdf
    • https://cdn.shopify.com/s/files/1/0428/6346/0508/files/voviluk.pdf
    • https://cdn.shopify.com/s/files/1/0432/5428/4450/files/supifamogitufesi.pdf
    • https://cdn.shopify.com/s/files/1/0431/9651/4461/files/zip_codes_usa.pdf
    • https://cdn.shopify.com/s/files/1/0432/1633/9111/files/zenefizivajaxowi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9902/1731/files/waiting_for_the_barbarians_free.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_off000067ba.bin
d5cef40683abf7e752f3e5ebbfa93e0a8f1868156a696a5497761b20786e2885		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67BA 4992 bytes
font_01_sfnt_off000078c6.bin
a3fd743e48a8a49d186406462be5aea5c8621ecb6e7195da7bc5126f9454c40d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78C6 10356 bytes
font_02_sfnt_off00009c0b.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C0B 4324 bytes

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