Malicious PDF — malware analysis report

Static analysis result for SHA-256 f23f37b6cc267521…

MALICIOUS

PDF

43.1 KB Created: 2020-08-11 18:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd29e8433bb828257f0ab7772fa8bb30 SHA-1: 9d51f514aa7a13732aefa37827de90a355ba376d SHA-256: f23f37b6cc267521dbf80d1e24460af0fc3e04291610ecc2b37c3717b620b8de
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. It also exhibits characteristics of a PDF link farm, with numerous links to external PDFs hosted on domains like 'cdn.shopify.com' and various other file-hosting sites. The document body, though partially corrupted, contains the same URL and title as the malicious redirector, suggesting a deliberate attempt to disguise the malicious link. No scripts were extracted, but the presence of a malicious redirector and link farm indicates a likely phishing or SEO spam campaign.

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/pify?keyword=los+anunnaki+creadores+de+la+humanidad+pdf+gratis
    • http://files.kentuckybaskets.org/uploads/1/3/2/6/132696598/678c5c601.pdf
    • http://files.aican.ca/uploads/1/3/1/0/131071166/8573426.pdf
    • http://files.bigpineschools.org/uploads/1/3/1/6/131637109/a3b7d6467.pdf
    • http://files.mwprofessionalphotography.com/uploads/1/3/1/4/131453393/rifigun.pdf
    • https://cdn.shopify.com/s/files/1/0434/2297/4117/files/pukaxunizumiwaj.pdf
    • https://cdn.shopify.com/s/files/1/0436/4913/8846/files/29994267182.pdf
    • https://cdn.shopify.com/s/files/1/0438/8939/3816/files/xewepimirosonuleraxokofak.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/mewisom.pdf
    • https://cdn.shopify.com/s/files/1/0437/0019/1387/files/telugu_devotional_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6151/8231/files/webemaxoligoxiwedi.pdf
    • https://cdn.shopify.com/s/files/1/0449/9944/2590/files/zumigutodopen.pdf
    • https://cdn.shopify.com/s/files/1/0433/1310/2998/files/majojukewumizugewuduz.pdf
    • https://cdn.shopify.com/s/files/1/0432/0601/7185/files/xabofos.pdf
    • https://cdn.shopify.com/s/files/1/0434/9073/8328/files/abscesos_cerebrales_pediatria.pdf
    • https://cdn.shopify.com/s/files/1/0431/6826/8456/files/berlin_conference_scramble_for_africa.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_off00004b8d.bin
bf3ad7424193276204ff32018b647d23c89efab2c253a724a7ff77aa5eff4977		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B8D 5576 bytes
font_01_sfnt_off00005e53.bin
ee52f48625ebfc8c2dabc6a9217ed1330d17ef74a197be8091285bae100a5df5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E53 8660 bytes
font_02_sfnt_off0000768c.bin
f0a613336dd306d1f04594bea068f5ef607b5863d68ef6085141e6fb7df2d7f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x768C 11564 bytes

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