Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8c6310af9dae24…

MALICIOUS

PDF

42.6 KB Created: 2020-08-13 02:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccef453ff8a561d57103467935db55af SHA-1: 67a8e60c83d8e2ac7cc93f4f66b9fcdb32013607 SHA-256: 4d8c6310af9dae243ecf2c0ec0028f2eb53e5af824d004a184c246b958e65f42
152 Risk Score

Malware Insights

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

The PDF contains a link disguised as a piano sheet music download, which redirects to malicious infrastructure. The ML classifier strongly flagged this PDF as malicious, and heuristic rules identified it as a redirector link and a link farm. The document body contains obfuscated text and embedded URLs, including the primary malicious redirector.

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=ballade+pour+adeline+original+piano+sheet+pdf
    • http://dunijove.clintonwhiting.com/uploads/1/3/0/7/130775129/dopaj.pdf
    • http://files.brancaleonifestival.com/uploads/1/3/0/7/130739225/7976247.pdf
    • http://wilikumi.lephoartgallery.com/uploads/1/3/1/3/131380005/9c428.pdf
    • http://xusetu.jgeconstruction.com/uploads/1/3/1/3/131379578/6269165.pdf
    • http://files.thedebuff.com/uploads/1/3/0/9/130969218/9847675.pdf
    • https://cdn.shopify.com/s/files/1/0437/8345/4871/files/xusifogolelusititig.pdf
    • https://cdn.shopify.com/s/files/1/0432/0811/4340/files/36039855678.pdf
    • https://cdn.shopify.com/s/files/1/0438/2189/1746/files/10650915774.pdf
    • https://cdn.shopify.com/s/files/1/0432/7941/7504/files/dunaxilulabaxovezes.pdf
    • https://cdn.shopify.com/s/files/1/0432/2145/0914/files/38518215459.pdf
    • https://cdn.shopify.com/s/files/1/0440/8393/7432/files/adaptability_test_2_in_air_force.pdf
    • https://cdn.shopify.com/s/files/1/0432/7974/5192/files/68348509605.pdf
    • https://cdn.shopify.com/s/files/1/0430/3110/1603/files/funenezidelitixoroxo.pdf
    • https://cdn.shopify.com/s/files/1/0440/8747/6389/files/31571583847.pdf
    • https://cdn.shopify.com/s/files/1/0431/1692/0994/files/wigimimodunezebopobinutem.pdf
    • https://cdn.shopify.com/s/files/1/0436/3055/9390/files/sidonirugenifuxe.pdf
    • https://cdn.shopify.com/s/files/1/0432/9878/3382/files/espresso_english_grammar_level_3_download.pdf
    • https://cdn.shopify.com/s/files/1/0449/7162/2559/files/self_certify_sickness.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_off00006405.bin
812e9a79de9d8e0a47ca84735d9bfb04052b751131ad02bc8fcf80fda76cf7cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6405 5352 bytes
font_01_sfnt_off0000762e.bin
1f959aa48409a35ac9c44002a08abe2387a16f046ed51b6e02dc1e99ec93e702		 pdf-font-stream PDF embedded font (sfnt) at offset 0x762E 13068 bytes

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