Malicious PDF — malware analysis report

Static analysis result for SHA-256 21130e437354ab4c…

MALICIOUS

PDF

41.2 KB Created: 2020-08-24 11:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b725eff2c63dbe7e722ef4176a0a08f9 SHA-1: e797663c284bc3b7474174fc4deadbc1b5d90993 SHA-256: 21130e437354ab4c2d638a65dc9be3bb9e5905105d702cc312fbdb22e5c82784
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=cubs+2020+schedule+pdf'. This URL is presented within the document body, disguised as a sports schedule, to entice users to click. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous other PDF links suggests a link farm or SEO poisoning attempt to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=cubs+2020+schedule+pdf
    • http://files.jeanfrankstark.com/uploads/1/3/2/6/132682303/8860886.pdf
    • https://cdn.shopify.com/s/files/1/0435/5761/7823/files/android_10_redmi_note_7_lavender.pdf
    • https://cdn.shopify.com/s/files/1/0429/8244/1113/files/kozatixes.pdf
    • https://cdn.shopify.com/s/files/1/0432/1551/9912/files/australian_map_outline.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/46496449222.pdf
    • https://cdn.shopify.com/s/files/1/0434/9722/6402/files/70811714316.pdf
    • https://cdn.shopify.com/s/files/1/0434/9306/4870/files/3702265320.pdf
    • https://cdn.shopify.com/s/files/1/0429/9515/5105/files/65008903236.pdf
    • https://cdn.shopify.com/s/files/1/0432/4520/7714/files/spelling_numbers_1_to_100_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0432/2656/2722/files/zimobotoroxedizeb.pdf
    • https://cdn.shopify.com/s/files/1/0437/6851/2669/files/didilekapatuludigabufota.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_off00005c5a.bin
44ebc5f04e1b53847772d994564a4ef2de6c407d965dba442714dff516f88b91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C5A 5256 bytes
font_01_sfnt_off00006e34.bin
5bcd4b0bba1cd8126ec1f550ac6b1a8d84ba26be5c92f913eab71a11a367cf00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E34 12820 bytes

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