Malicious PDF — malware analysis report

Static analysis result for SHA-256 1932c5ade37c79bf…

MALICIOUS

PDF

40.8 KB Created: 2020-08-15 07:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6bb27d5f10bad2cc19593dc59999b34f SHA-1: 003d37b359a8a017a4675ab03367924478f286ff SHA-256: 1932c5ade37c79bf135f8b6145e91bdbe40d63742f36e2b8943983230d4768c1
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document contains a lure for free software, which includes a link to a known malicious redirector. The document also exhibits characteristics of a link farm, with numerous embedded links to other PDFs, and instructs the user to install remote support tools. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of it being used to deliver a second-stage payload or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=cat+et+software+free
    • http://files.kristiepottertherapy.com/uploads/1/3/1/6/131637169/8784677.pdf
    • http://files.theoasisconference.com/uploads/1/3/1/3/131380456/73c2f15b.pdf
    • http://files.parkerconverse.com/uploads/1/3/1/3/131379280/bd9bb.pdf
    • http://files.riccivineyards.com/uploads/1/3/1/1/131164567/faf569e8182f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/8468/3166/files/dabipozi.pdf
    • https://cdn.shopify.com/s/files/1/0432/4235/6904/files/zugezupok.pdf
    • https://cdn.shopify.com/s/files/1/0438/0511/4528/files/68054035619.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/berujixawajibexuxutuzogar.pdf
    • https://cdn.shopify.com/s/files/1/0429/9931/6639/files/weletuxejip.pdf
    • https://cdn.shopify.com/s/files/1/0437/7971/9330/files/tezoxozawesakuvesapu.pdf
    • https://cdn.shopify.com/s/files/1/0435/8248/8733/files/37005566766.pdf
    • https://cdn.shopify.com/s/files/1/0435/4686/9915/files/xodos.pdf
    • https://cdn.shopify.com/s/files/1/0434/5777/3718/files/paras_civil_code_obligations_and_contracts.pdf
    • https://cdn.shopify.com/s/files/1/0433/3037/1738/files/fizasivaluveziluje.pdf
    • https://cdn.shopify.com/s/files/1/0435/6803/8049/files/budetaxaraxonogodaz.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_off00006227.bin
d986abf7cd6bdad80b393637c266f38eaba68c53c24a60e6be8f4b0303eafccb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6227 4728 bytes
font_01_sfnt_off00007259.bin
2ac3b111e1cc05449746f2d387c18f247f7db3992e9632698b0d03b809da0cf8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7259 10624 bytes

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