Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f27b15fa8adbb8f…

MALICIOUS

PDF

57.8 KB Created: 2020-07-20 04:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 171bbb4bae679bd7222d588e6937db3b SHA-1: 8fc1627b6293ac2bc861ecf01e8b8662f85d2976 SHA-256: 9f27b15fa8adbb8ffe3a2fcee71f34876a018ca2c9d3ee4e02eacc0c7215b0e4
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass of external links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'solving inequalities worksheet and answers'. The primary attack pattern involves redirecting users to malicious sites via these links, likely for phishing or malware delivery. No scripts were extracted, limiting the analysis of direct payload execution.

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.ru/wb?keyword=solving%20inequalities%20worksheet%20and%20answers
    • http://files.picaprograms.com/uploads/1/3/1/4/131438741/sevudoka.pdf
    • http://files.damnphotoartist.com/uploads/1/3/0/7/130738739/sekibuvigekami-fakarinegadep.pdf
    • http://files.constantlyintouch.com/uploads/1/3/2/6/132682076/rinob_muxebifapafoxal.pdf
    • http://files.restormin.org/uploads/1/3/0/7/130739758/1081b3c1b15.pdf
    • http://files.piecesearlylearning.com/uploads/1/3/1/4/131454766/xezuposuwafilaw_larodu.pdf
    • http://files.safedeposit.company/uploads/1/3/1/6/131637104/vitapegirijovos.pdf
    • http://files.darfdesign.com/uploads/1/3/0/8/130814682/9418311.pdf
    • http://files.louisianaalligators.com/uploads/1/3/1/8/131858044/444750.pdf
    • http://files.boneandjointdocs.com/uploads/1/3/1/6/131637695/9726809.pdf
    • https://lozurimi.files.wordpress.com/2020/07/94897436671.pdf
    • https://turimofusi.files.wordpress.com/2020/07/23817808742.pdf
    • https://pudaditi.files.wordpress.com/2020/07/sotugoverezexizizab.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xokuwunojuvilil.pdf
    • https://cdn.shopify.com/s/files/1/0432/8125/2507/files/dosasufikozapubaj.pdf
    • https://cdn.shopify.com/s/files/1/0432/2764/4072/files/83509266753.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85947343199.pdf
    • https://cdn.shopify.com/s/files/1/0432/6031/3763/files/mevumutidef.pdf
    • https://cdn.shopify.com/s/files/1/0429/1565/9942/files/kegubek.pdf
    • https://cdn.shopify.com/s/files/1/0431/7878/6965/files/susilozadugivu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3786/7687/files/nowonesi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fofigez.pdf
    • https://cdn.shopify.com/s/files/1/0431/8917/4432/files/gikozafefurumibanobu.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_off00009574.bin
b49e5ee1b05d6a9f96f591cf5c09878de3f02c5e202e18d1df0665d6b1911a67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9574 5416 bytes
font_01_sfnt_off0000a7dc.bin
a3da48402630e084c7a8c5031ae6e0bab2c0d6fd58c6703a13360f50693a687e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7DC 15176 bytes

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