Malicious PDF — malware analysis report

Static analysis result for SHA-256 1380402df78c62e7…

MALICIOUS

PDF

44.8 KB Created: 2020-07-25 00:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2a896797407ad4a1a34002728f95d01 SHA-1: 35c10e6401db319d08e5d6ec5e5e9fe175be04e7 SHA-256: 1380402df78c62e722e13eeb0e9e28f61e7caf68e42ac21801a657f99921c044
174 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector known to host malicious content. The document body, though heavily obfuscated, suggests a lure related to educational worksheets, likely to disguise the malicious intent. The presence of numerous external links, including a link farm, indicates an attempt to drive traffic to potentially harmful sites, possibly for further exploitation or phishing.

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=math%203%20digit%20subtraction%20with%20regrouping%20worksheets
    • http://files.smrtartdepartment.org/uploads/1/3/1/3/131379320/835922.pdf
    • http://files.shesthefirstwisconsin.org/uploads/1/3/2/7/132712006/dapuvizupedana.pdf
    • http://files.merionvillage.org/uploads/1/3/2/8/132814935/cb1d90.pdf
    • http://files.tarjetasyregalosmolonas.com/uploads/1/3/1/3/131380600/8806873.pdf
    • http://files.ultimatetrains.com/uploads/1/3/0/8/130873941/4886830.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5618/4996/files/16838878740.pdf
    • https://cdn.shopify.com/s/files/1/0431/3183/0421/files/72058160941.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87294954422.pdf
    • https://cdn.shopify.com/s/files/1/0434/8477/4552/files/wenukabupukenil.pdf
    • https://cdn.shopify.com/s/files/1/0433/3853/0965/files/topijozuvinexomelumorow.pdf
    • https://cdn.shopify.com/s/files/1/0433/4498/6280/files/91272946593.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kekesapenogetiru.pdf
    • https://cdn.shopify.com/s/files/1/0431/8419/3696/files/sowexusoxarivikakivikolir.pdf
    • https://cdn.shopify.com/s/files/1/0435/5797/8273/files/49340413104.pdf
    • https://cdn.shopify.com/s/files/1/0428/8803/6505/files/935063997.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_off00007051.bin
596dcfef2f107752f61719668453548743d74f51aa8df6edc2edd10a14da887b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7051 5648 bytes
font_01_sfnt_off00008384.bin
97bdd200f07cfba0bc5146c1be03c9d6fd5fe307c7010e2913c712c471f4b304		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8384 9948 bytes

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