Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c74e9801856029…

MALICIOUS

PDF

49.1 KB Created: 2020-08-12 01:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: acc21743b0f3acee33171e689e431b58 SHA-1: 1651fbe5c6f5c47d4ed8adcac7de4a38b20febd9 SHA-256: 71c74e9801856029e53cbc41743a346108e3e5603b12990738d1b665fa7ceecb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with the primary link directing to a known malicious redirector. The document body and embedded links suggest a tactic of creating a link farm to attract search engine traffic and lure users to malicious sites. The ML classifier also strongly indicated maliciousness.

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/wb?keyword=non%20ferrous%20metallurgy%20pdf
    • http://files.matterwithcuriosity.com/uploads/1/3/1/4/131407227/vupokat.pdf
    • http://denowalib.galeriafwd.pl/uploads/1/3/1/6/131637836/vasofepigimital-ruzokiravuna.pdf
    • http://files.crudupwardactivitycenter.org/uploads/1/3/0/8/130873708/07e1533b9039d.pdf
    • http://pexoz.undertheirrelevance.com/uploads/1/3/2/3/132303027/3abc22203fbbb0b.pdf
    • http://files.westhopeschool.com/uploads/1/3/1/4/131406060/xomamaredojenikalum.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/5565/0718/files/reliability_analysis_of_structures.pdf
    • https://cdn.shopify.com/s/files/1/0434/1976/2840/files/54669716614.pdf
    • https://cdn.shopify.com/s/files/1/0428/0814/8127/files/fuluwi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7098/8188/files/5757300648.pdf
    • https://cdn.shopify.com/s/files/1/0439/9231/8110/files/39477795811.pdf
    • https://cdn.shopify.com/s/files/1/0432/1856/7335/files/faxoleva.pdf
    • https://cdn.shopify.com/s/files/1/0432/0159/3502/files/gumananigeterew.pdf
    • https://cdn.shopify.com/s/files/1/0429/0081/6028/files/list_reverse_python.pdf
    • https://cdn.shopify.com/s/files/1/0429/1215/3766/files/75593092734.pdf
    • https://cdn.shopify.com/s/files/1/0432/7895/8758/files/debopofoziroponi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4906/6397/files/zekamakufurabigosar.pdf
    • https://cdn.shopify.com/s/files/1/0440/8619/8424/files/50636417561.pdf
    • https://cdn.shopify.com/s/files/1/0430/0098/7811/files/4812012868.pdf
    • https://cdn.shopify.com/s/files/1/0429/9217/3217/files/72093494144.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_off0000822d.bin
31ce2853eb5f2d82c6f7500aba1f6b82b402198a0d2a8c7bf88831d994b8a390		 pdf-font-stream PDF embedded font (sfnt) at offset 0x822D 5432 bytes
font_01_sfnt_off000094a0.bin
868ff437022a0b5435c64b1ab3b69f2347198e13ad02cf1195d1e61a52c3efd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94A0 10240 bytes

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