Malicious PDF — malware analysis report

Static analysis result for SHA-256 45f8382c6fe1d52f…

MALICIOUS

PDF

42.8 KB Created: 2020-08-30 02:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3b07dffb33b4fb199e6aa735258de24 SHA-1: be97e49622af2f8dee9eea5c07471263f1301760 SHA-256: 45f8382c6fe1d52f28c7f05828cab21b2156ec509da85f67139f25d9110c5266
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL, which is a common tactic for delivering malicious payloads. The document body and embedded links suggest a lure related to educational content, likely to trick users into clicking the malicious link. The ML classifier strongly indicated maliciousness, and the PDF structure includes a link farm, further supporting a malicious intent.

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/wix?keyword=getting+to+know+you+activity+for+first+day+of+school
    • https://cdn.shopify.com/s/files/1/0428/1348/9318/files/58313898336.pdf
    • https://cdn.shopify.com/s/files/1/0433/6146/8574/files/minecraft_tekkit_launcher_cracked.pdf
    • https://cdn.shopify.com/s/files/1/0429/2670/2755/files/flaws_bastille_piano_sheet_music.pdf
    • https://static.usrfiles.com/ugd/f65518_3a0d63498a5f43b6aa57539e709440a7.pdf
    • https://cdn.shopify.com/s/files/1/0435/8835/4207/files/normal_probability_distribution_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/4305/2953/files/gezibarijovumuputarag.pdf
    • https://cdn.shopify.com/s/files/1/0432/5516/9186/files/21119735183.pdf
    • https://cdn.shopify.com/s/files/1/0433/7834/4097/files/41154625091.pdf
    • https://cdn.shopify.com/s/files/1/0428/5526/8519/files/.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b35.bin
aa6883f0d1ea897038275c425a2ae2f261fe593df7c4927568502890c972d053		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B35 5516 bytes
font_01_sfnt_off00006e17.bin
3a68a024fb9d317bafb13deb4b2342d368b883331c2e0adcdc3d48aaf58bcc86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E17 10088 bytes
font_02_sfnt_off00009090.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9090 4324 bytes

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