Malicious PDF — malware analysis report

Static analysis result for SHA-256 c52a183b4284ae78…

MALICIOUS

PDF

52.2 KB Created: 2020-08-16 23:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3411e3473b2dcbaaa69d33d7d7abdf25 SHA-1: a1b7794b9800be217a5724899cb6544efeb04989 SHA-256: c52a183b4284ae78722e17696adfaef5455900ee8e597c55b054e3aaef2f4a8c
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 'https://ttraff.com/pify?keyword=ebates+app+free'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many hosted on cdn.shopify.com. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirect URL and a benign-looking PDF filename, suggesting a lure to disguise the 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/pify?keyword=ebates+app+free
    • http://megewujo.rockbug.org/uploads/1/3/2/6/132695531/xezuverurabipuporug.pdf
    • http://giwodevi.whittonprecision.com/uploads/1/3/1/4/131437064/832b13.pdf
    • http://files.clevelandwildcatbaseball.com/uploads/1/3/1/6/131637056/xodupogutovamiv_bofojulu.pdf
    • http://files.beyondessentialoil.com/uploads/1/3/0/7/130739232/rukozijoroni.pdf
    • http://files.eastendspecialplayers.org/uploads/1/3/0/9/130969192/bojokimokusejo_gaguxiriza_wapitore.pdf
    • https://cdn.shopify.com/s/files/1/0431/2154/1274/files/bidunotogo.pdf
    • https://cdn.shopify.com/s/files/1/0428/6955/5359/files/webinejokuzinenosufufa.pdf
    • https://cdn.shopify.com/s/files/1/0436/6853/7497/files/fukimofiv.pdf
    • https://cdn.shopify.com/s/files/1/0436/8252/9445/files/chair_conformation_cis_vs_trans.pdf
    • https://cdn.shopify.com/s/files/1/0431/7793/5004/files/asthma_severity_classification_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0431/3127/3365/files/bawepudobunekibemanavi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5430/9284/files/proyecto_de_investigacin_libros.pdf
    • https://cdn.shopify.com/s/files/1/0430/0128/2711/files/tisugera.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/6219719719.pdf
    • https://cdn.shopify.com/s/files/1/0430/6193/6282/files/bidimuliveretiz.pdf
    • https://cdn.shopify.com/s/files/1/0434/5495/5672/files/zufisubowiriduvumuzere.pdf
    • https://cdn.shopify.com/s/files/1/0428/3174/1095/files/cinematography_shots_and_camera_angles.pdf
    • https://cdn.shopify.com/s/files/1/0436/5585/6281/files/pumotovubufuridanige.pdf
    • https://cdn.shopify.com/s/files/1/0434/7494/4153/files/37944349281.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
stream_004_off00007b2a.bin
53d232ba0eeb9c947e8fb51395f9b6e55ee80dcdf1bb97f3bfbcd4358ee03fce		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x7B2A 12828 bytes
font_00_sfnt_off00006a42.bin
a669fe02db14594781e26eb1d4b2ab060b4f20b3cd49bd48c0076682db2b4eca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A42 4960 bytes
font_02_sfnt_off00009eca.bin
a8133ef66ee23d7fb2ce25f7cf226504d6f143a35c06b9279fdd4e082ff88d9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9ECA 10828 bytes

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