Malicious PDF — malware analysis report

Static analysis result for SHA-256 decb39d4debca63a…

MALICIOUS

PDF

87.1 KB Created: 2020-09-17 04:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21cd24dc2785c54eb57e55781163201d SHA-1: 90c67ee448b2767a15d5bb76297de2a82a4f1868 SHA-256: decb39d4debca63a07841834d26daa71a8bdd5c5e7dbdbec0816315453a94a1b
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/pify?keyword=monkey+wrench+lyrics+deutsch'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, including one to 'https://cdn.shopify.com/s/files/1/0429/2971/7407/files/framed_ink_descargar.pdf'. The document body, though heavily obfuscated, contains references to these URLs, suggesting a lure to external content that likely leads to malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=monkey+wrench+lyrics+deutsch
    • https://cdn.shopify.com/s/files/1/0429/2971/7407/files/framed_ink_descargar.pdf
    • https://cdn.shopify.com/s/files/1/0435/3179/6634/files/74655893802.pdf
    • https://cdn.shopify.com/s/files/1/0434/5040/0928/files/bimanual_coordination_relative_phase.pdf
    • https://cdn.shopify.com/s/files/1/0428/5366/2887/files/arkansas_game_and_fish_app_android.pdf
    • https://d6326a48-fdb5-4244-80d7-91285a12c3ce.filesusr.com/ugd/592671_06cc13854d544b1daa6ade77f21e4880.pdf?index=true
    • https://b8013320-11bb-4859-8a95-1c68116d3a7b.filesusr.com/ugd/18574e_d3e794e1436f422cb087554f30931892.pdf?index=true
    • https://d2610be2-e5ea-42cd-98b0-45183d5b9801.filesusr.com/ugd/c83fdb_c70fead30a1a43f28142427d59451fa6.pdf?index=true
    • https://347d6502-3f5e-4c00-9ee4-850c93747685.filesusr.com/ugd/7c1f05_353656555b694e5a953b8c6af6519d8c.pdf?index=true
    • https://19d7bdb8-1b1e-40db-92a3-b19ff171842a.filesusr.com/ugd/111c46_4a21705e448c4321baf533e9de65a9d0.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0438/7926/8520/files/56867525106.pdf
    • https://cdn.shopify.com/s/files/1/0445/3564/4319/files/centrifugal_pump_curves.pdf
    • https://cdn.shopify.com/s/files/1/0434/6390/1348/files/desigofovizojim.pdf
    • https://cdn.shopify.com/s/files/1/0431/1996/8417/files/42107809344.pdf
    • https://cdn.shopify.com/s/files/1/0430/6550/8002/files/88701722266.pdf
    • https://cdn.shopify.com/s/files/1/0435/3579/4327/files/zuziwatoboginaz.pdf
    • https://cdn.shopify.com/s/files/1/0429/0006/2367/files/australian_flag_printable.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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca73.bin
6329f019404111d8432f0978713d4b50096c9bd4de93032f50a253c71a150016		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA73 5428 bytes
font_01_sfnt_off0000ddb5.bin
ab34b1bf94b24085a51c647df6b19041afb174ae1dc2bbe9a1ef08082e269695		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB5 5080 bytes
font_02_sfnt_off0000ef19.bin
d6a5835caadd9d7db5088d894f00bcbde52b52e55f084451b90759933a1299e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF19 2652 bytes
font_03_sfnt_off0000fa1b.bin
c8a00b257f4f4c79e38e175b190165a417595f9e1fd8b527ede1a1e13105a05a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1B 4492 bytes
font_04_sfnt_off0001083e.bin
6f63c32bb6e8c2138437b3b8b5f44236ef7c5731670980619f29e2f2bfa8f274		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1083E 18368 bytes
font_05_sfnt_off00014037.bin
205ce191433fd5870b6cb6b55f30592abea4b5227fd3a85e96129f2b2ed83d89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14037 3416 bytes

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