Malicious PDF — malware analysis report

Static analysis result for SHA-256 46ec317b981afbf8…

MALICIOUS

PDF

43.9 KB Created: 2020-08-31 07:33:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c95717ec815ca13ca779a357e8ae314a SHA-1: 4a5b25d0a9e5052fdf1834745b4553aaf08141f9 SHA-256: 46ec317b981afbf8669a6eaea5da99bc7ce71b9ac92879497ff7c821c3b36626
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the text 'Flows hd 1. 14' and the malicious URL, suggesting a lure to a malicious site. The presence of many external PDF links, some benign and some potentially malicious, indicates a link farm or redirection strategy. The ML classifier strongly flagged this PDF as malicious.

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/wix?keyword=flows+hd+1.+14
    • https://cdn.shopify.com/s/files/1/0434/7029/1096/files/mc_hammer_can_t_touch_this.pdf
    • https://cdn.shopify.com/s/files/1/0434/8097/3477/files/rust_oleum_cabinet_transformation_kit_reviews.pdf
    • https://cdn.shopify.com/s/files/1/0438/8651/0232/files/planeaciones_de_pensamiento_matematico_para_preescolar.pdf
    • https://cdn.shopify.com/s/files/1/0432/2253/2251/files/nims_800_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/8832/1437/files/arduino_uno_pin_description.pdf
    • https://cdn.shopify.com/s/files/1/0430/4715/7914/files/battlestar_galactica_razor_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0435/1403/6383/files/aiag_ppap_manual_download.pdf
    • https://static.usrfiles.com/ugd/91e123_c71007f32b284bcead4674fa6d749995.pdf
    • https://static.usrfiles.com/ugd/b8c837_17210462a724451698488763164e7bf8.pdf
    • https://static.usrfiles.com/ugd/bb13a2_a3dd3f41d7134b13923cd73ed473818c.pdf
    • https://static.usrfiles.com/ugd/b8c837_28f5603e6917447aa94c113b22a1dedb.pdf
    • https://static.usrfiles.com/ugd/ecec20_b406fde89eca429086e256a8dadf000b.pdf
    • https://static.usrfiles.com/ugd/b8c837_22b63078c113456380a9961e3a46eb28.pdf
    • https://static.usrfiles.com/ugd/b8c837_0cb1711f615347d2bd7a0b277cfc7a8f.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
font_00_sfnt_off00006179.bin
27fae5872318b81c14f68a9c21f1d77900fc1b851f78336d7640995e59e4a117		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6179 4136 bytes
font_01_sfnt_off00007027.bin
0dd1d1b7b74c9e72018c9f1612ac903ee9264415ab7ed7c78f245e7cf20a88f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7027 4828 bytes
font_02_sfnt_off000080ab.bin
e5bb4ad7246feae5d10ba08355304b8778c57ede026a8781edba794be1dea248		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80AB 9864 bytes

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