Malicious PDF — malware analysis report

Static analysis result for SHA-256 c383b81e1a359ce3…

MALICIOUS

PDF

42.2 KB Created: 2020-08-24 17:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35885a6da9c65c1c76b3f1f179d068ec SHA-1: cd6aef157acd2ded730726cda4dabcaffa07ae8c SHA-256: c383b81e1a359ce3e79c513c32904013ea9e94ee72e6fb8d4426cebc1ab271d0
152 Risk Score

Malware Insights

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

The PDF contains embedded links that lead to a malicious redirector, which in turn points to a large collection of other PDFs hosted on Shopify. The document body, though partially corrupted, suggests a lure related to 'engagement ring settings guide'. The primary malicious activity observed is the redirection to a link farm designed to distribute further malicious content.

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.com/pify?keyword=engagement+ring+settings+guide
    • http://files.caringhomesofbend.com/uploads/1/3/1/3/131398479/2158580.pdf
    • http://files.italianschoolofcycling.com/uploads/1/3/2/6/132696145/1599060.pdf
    • http://rimopuvux.cmcastillowriter.com/uploads/1/3/1/3/131380429/4101219.pdf
    • https://cdn.shopify.com/s/files/1/0434/3391/8616/files/potion_of_longevity_5e.pdf
    • https://cdn.shopify.com/s/files/1/0431/3061/8020/files/exin_agile_scrum_foundation.pdf
    • https://cdn.shopify.com/s/files/1/0433/9033/7189/files/ruxezuxijuzis.pdf
    • https://cdn.shopify.com/s/files/1/0432/8125/2512/files/17279797637.pdf
    • https://cdn.shopify.com/s/files/1/0438/9496/4392/files/blendtec_professional_800.pdf
    • https://cdn.shopify.com/s/files/1/0433/8486/4917/files/roasted_salted_cashew_nuts_nutritional_information.pdf
    • https://cdn.shopify.com/s/files/1/0429/1231/7603/files/47607614677.pdf
    • https://cdn.shopify.com/s/files/1/0432/8567/6188/files/o_poder_da_cabala_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/5542/4423/files/blockchain_for_enterprise_applications.pdf
    • https://cdn.shopify.com/s/files/1/0440/6594/7800/files/vujidepatem.pdf
    • https://cdn.shopify.com/s/files/1/0433/6667/8696/files/blank_space_song_ringtone_zedge.pdf
    • https://cdn.shopify.com/s/files/1/0428/9606/4671/files/kajojexigorusapa.pdf
    • https://cdn.shopify.com/s/files/1/0427/5005/0460/files/nutrition_information_egg_roll.pdf
    • https://cdn.shopify.com/s/files/1/0429/4790/3644/files/pokemon_perfect_platinum.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_off0000670e.bin
10a1390ac70ac29a6c90d835936ea5901c9b254d4ffbbe9c200fe4fe88e82f74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x670E 5072 bytes
font_01_sfnt_off00007836.bin
8c84d3d063d9bf0ba5b95083f9e54790c9841d43952cd88d2d334acd9d1bec67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7836 10540 bytes

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