Malicious PDF — malware analysis report

Static analysis result for SHA-256 758366caf0ae4696…

MALICIOUS

PDF

49.1 KB Created: 2020-08-12 20:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec1127377fa17d9230bbc0f4e2abef33 SHA-1: c613c8540d341f388402ab7781e7d7c35f1ddbd9 SHA-256: 758366caf0ae469687058ff2a48251f7a6ae6e2b04cf80929032e8179b7df5c7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to a link farm designed for SEO manipulation, with one critical link identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL that triggers the malicious redirector. This suggests a phishing or scam attempt to direct users to 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.cc/wb?keyword=walter%20the%20farting%20dog%20book%20pdf
    • http://jusafe.beastbeats.net/uploads/1/3/1/3/131397971/nizidof_buduve_sifop.pdf
    • http://fagulatom.zapmobileentertainment.com/uploads/1/3/1/4/131452903/webujelatupuvusi.pdf
    • http://files.oloofaka.com/uploads/1/3/1/4/131407952/f0b7bafbd2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5288/3352/files/68711291756.pdf
    • https://cdn.shopify.com/s/files/1/0435/2720/9120/files/patalavavitof.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/9467339244.pdf
    • https://cdn.shopify.com/s/files/1/0427/4785/5004/files/vemedotokodubegotenemare.pdf
    • https://cdn.shopify.com/s/files/1/0436/3599/8880/files/energy_flow_in_aquatic_ecosystem.pdf
    • https://cdn.shopify.com/s/files/1/0432/2947/9072/files/the_four_noble_truths_buddhism.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dusegu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6587/files/84504104846.pdf
    • https://cdn.shopify.com/s/files/1/0430/7625/5897/files/zumibovatiboxori.pdf
    • https://cdn.shopify.com/s/files/1/0449/4213/1355/files/john_wick_chapter_2_subtitles.pdf
    • https://cdn.shopify.com/s/files/1/0434/4669/8146/files/86358491464.pdf
    • https://cdn.shopify.com/s/files/1/0430/5112/2842/files/58266715783.pdf
    • https://cdn.shopify.com/s/files/1/0432/5376/0162/files/inflammatory_bowel_disease_in_dogs.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006842.bin
0ec329ddcfd51f4cb958079faa5fc8d67344668cd97e6675766ef6d0384f80b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6842 7588 bytes
font_01_sfnt_off0000820a.bin
7318bf9e70a539518b7797fee9e46d215e5c155cd267db0ff2d42e3b2918f661		 pdf-font-stream PDF embedded font (sfnt) at offset 0x820A 5344 bytes
font_02_sfnt_off00009431.bin
bb1030882d37d87eb4b9145b26319465df0ec18187ee53741a3859e380e7de1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9431 10208 bytes

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