Malicious PDF — malware analysis report

Static analysis result for SHA-256 a663c2c502a006d9…

MALICIOUS

PDF

40.7 KB Created: 2020-08-30 02:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d50b21cca511982c193033490ed5e139 SHA-1: e8af8e6b43845976c5c283c740fd5bd02355b0b8 SHA-256: a663c2c502a006d91f9cc5fe2b8771d2f08b2747906df012b99409094f3106fd
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the primary malicious URL. 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 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/wix?keyword=pilocarpine+davis+pdf
    • https://cdn.shopify.com/s/files/1/0437/1880/3605/files/74935965475.pdf
    • https://cdn.shopify.com/s/files/1/0429/1762/6012/files/48864953154.pdf
    • https://cdn.shopify.com/s/files/1/0463/7717/3147/files/basdai_score_form.pdf
    • https://cdn.shopify.com/s/files/1/0432/8207/1716/files/tum_hi_ho_female_version_mp3_song_download.pdf
    • https://static.usrfiles.com/ugd/01e791_55bbdd55e807484d8d21de61af4c9191.pdf
    • https://static.usrfiles.com/ugd/b8c837_885c92d5ba4a4cb8bff8f0cc4e663f9c.pdf
    • https://static.usrfiles.com/ugd/b8c837_33ace708e8524835b9e9b6d815723726.pdf
    • https://static.usrfiles.com/ugd/7d1dc9_94b95a3e330746fdbad348da76371165.pdf
    • https://static.usrfiles.com/ugd/6116da_14734ab827ae43ce93ac0a7b770b406f.pdf
    • https://static.usrfiles.com/ugd/b8c837_fe0b654dd6f3450fa4922c0acb5911b7.pdf
    • https://static.usrfiles.com/ugd/d2751c_b38b56d60ebe4087b8ccdfea6d6d1a77.pdf
    • https://static.usrfiles.com/ugd/49be48_3a88b2cb8d87442abe7fa2ab59a0ff00.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_off0000604b.bin
ea4137564d403410ea56fd1d5d6f05d13fd235ed6df4867542c2344e125bb282		 pdf-font-stream PDF embedded font (sfnt) at offset 0x604B 5208 bytes
font_01_sfnt_off00007207.bin
62f8ad976170f87194eb8c570f2302079edc4338e9deaffb8c1f4b73d9e4c3f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7207 10616 bytes

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