Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e42dbd4dc8f10f…

MALICIOUS

PDF

35.0 KB Created: 2020-09-17 03:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc2ca2b2915a9928868dcb8b4a692cc3 SHA-1: 5e23daacc8cd8fd1318ebd7aa1cb068f4030351e SHA-256: 71e42dbd4dc8f10ff03b67ffcf3687fecea245bea53ff41247526d24bc360a49
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to disposable domains and are likely part of a link farm designed to improve search engine rankings or distribute malware. One of the embedded URLs, 'https://ttraff.link/wix?keyword=i+have+a+dream+speech+commonlit+answer+key', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wix?keyword=i+have+a+dream+speech+commonlit+answer+key
    • http://files.caasfepconference2020.org/uploads/1/3/1/4/131454316/3755089.pdf
    • http://zapogip.likeagoodbook.com/uploads/1/3/1/3/131382406/615084baaca.pdf
    • http://files.kingfishersbridge.org/uploads/1/3/0/8/130873829/tiburasololuber.pdf
    • http://wetobax.eleventhhourliterary.com/uploads/1/3/1/6/131606003/wilujiji.pdf
    • http://tafali.elkcreekbaptist.com/uploads/1/3/0/8/130874629/7b11fb.pdf
    • http://files.stalbansbg.co.uk/uploads/1/3/2/6/132680986/megiwapi_gixed_kavivogix.pdf
    • http://files.sarahdrakeart.com/uploads/1/3/0/7/130775750/fanib.pdf
    • http://radovuxe.tcrcatering.com/uploads/1/3/1/6/131606615/4b9439ee8c.pdf
    • http://banami.morethanahandyman.org/uploads/1/3/1/8/131856149/1904761.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0506/6913/files/borivonuwojemorepopibaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/6676/9058/files/lunugetagegiwabubilosi.pdf
    • https://cdn.shopify.com/s/files/1/0436/0201/8467/files/contractual_periodic_tenancy_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/8360/3873/files/guitar_rig_5_preset.pdf
    • https://cdn.shopify.com/s/files/1/0430/7812/3680/files/strep_bacteremia_guidelines.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_off00004b83.bin
c735b70275783ed6f01268b21195ef0bd1da629b25f1b86dbb16355cdfcbe8e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B83 5568 bytes
font_01_sfnt_off00005e61.bin
d79f8346b6b99a8bbbcc39e0170faf19edeae041f0882c9332abb7cb9280fc6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E61 9592 bytes

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