Malicious PDF — malware analysis report

Static analysis result for SHA-256 11e68a72e587d1ad…

MALICIOUS

PDF

45.1 KB Created: 2020-08-23 12:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c418e13032f8ff39ef80dcb523dd0b40 SHA-1: e2a69f7ccd2f4d6cd1a6b00ee28301094e6459d0 SHA-256: 11e68a72e587d1adba481539e322a61d93b135f7c3af5edc283ff8674d8d076e
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded links, with at least one identified as a malicious redirector. It also impersonates cloud document services to trick users into interacting with the document. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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/pify?keyword=top+5+productivity+apps+for+android
    • http://maruleb.ultraxenon.co.uk/uploads/1/3/1/4/131452958/2943282.pdf
    • http://files.okmfg.com/uploads/1/3/1/1/131163747/4070118.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0440/7764/5989/files/85058686255.pdf
    • https://cdn.shopify.com/s/files/1/0430/3519/7602/files/channel_3_weather_cleveland.pdf
    • https://cdn.shopify.com/s/files/1/0431/7098/8188/files/gavoduvekelabidufegolateg.pdf
    • https://cdn.shopify.com/s/files/1/0431/0971/2023/files/dujime.pdf
    • https://cdn.shopify.com/s/files/1/0431/4333/2000/files/88254629675.pdf
    • https://cdn.shopify.com/s/files/1/0431/7573/9553/files/66330445591.pdf
    • https://cdn.shopify.com/s/files/1/0431/7007/0687/files/jolifobuzijedozutujafi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6294/2101/files/tarosa.pdf
    • https://cdn.shopify.com/s/files/1/0440/5359/4277/files/89138505124.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/75977767507.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006554.bin
3823808e0b71f710bde2e5b384bf510f1e7843cfd5041b73702585ea6daf1b79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6554 5116 bytes
font_01_sfnt_off000076cc.bin
db28d4881c273b4ec913d74b52c95acf61dbcb3db0bedff49b9c3acde5372eec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76CC 10128 bytes
font_02_sfnt_off00009987.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9987 4324 bytes

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