Malicious PDF — malware analysis report

Static analysis result for SHA-256 24e3ecdc3f5819c8…

MALICIOUS

PDF

55.4 KB Created: 2020-08-22 07:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 147742bdf8eac2051de7a841365101ae SHA-1: 57be3d6dd8d4fa811899bf171d8a734492ff9365 SHA-256: 24e3ecdc3f5819c81c7a6d7191716e2cff1840d22b7ca06fa6b54dca0d999894
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one prominent link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to sheet music and the malicious URL. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of it being used for malicious redirection or hosting further malicious content.

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.cc/pify?keyword=habanera+from+carmen+sheet+music
    • http://files.dralfonsomercado.com/uploads/1/3/0/7/130740051/biroselexa.pdf
    • http://lurexotek.powysdragons.com/uploads/1/3/1/0/131070588/d367351c3c7574.pdf
    • http://jitem.ownerbuildercourses.com/uploads/1/3/1/6/131606746/a6366.pdf
    • https://cdn.shopify.com/s/files/1/0433/9499/0231/files/lisakunem.pdf
    • https://cdn.shopify.com/s/files/1/0439/3956/1630/files/mathematical_puzzles_peter_winkler.pdf
    • https://cdn.shopify.com/s/files/1/0431/0056/9766/files/asamblea_general_de_la_onu.pdf
    • https://cdn.shopify.com/s/files/1/0437/5409/4753/files/nakipugupesej.pdf
    • https://cdn.shopify.com/s/files/1/0449/2269/9943/files/easy_backgammon_rules.pdf
    • https://cdn.shopify.com/s/files/1/0428/9134/6079/files/english_to_german_translation_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/8434/9589/files/kuvuluv.pdf
    • https://cdn.shopify.com/s/files/1/0430/0003/7527/files/tofopiwulewiw.pdf
    • https://cdn.shopify.com/s/files/1/0437/9767/6192/files/23614034364.pdf
    • https://cdn.shopify.com/s/files/1/0450/7552/9891/files/nespresso_machine_user_guide.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006067.bin
dd078bab26a86aaab3ba60dbf77fdeeda2f9f9bd73caa35499c12668bcf73051		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6067 5072 bytes
font_01_sfnt_off0000716b.bin
f93542dbf11e1b78b0e03947724839818dd350ad06a5f6d49fbf9462215d74ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x716B 2060 bytes
font_02_sfnt_off00007b12.bin
8601982fedb880fadd7bc402c1714845fce646bce12aada6e2d7829bd1f3218a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B12 15564 bytes
font_03_sfnt_off0000ab24.bin
4360e29b7d2504916afe74d557016965ce00ddb6e9b1d1498b998f2d7a1046f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB24 16184 bytes
font_04_sfnt_off0000c065.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC065 4324 bytes

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