Malicious PDF — malware analysis report

Static analysis result for SHA-256 d72f98af65c357f9…

MALICIOUS

PDF

46.6 KB Created: 2020-08-22 22:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1bf3d9dcaeb6b8e6595bb59057628fe SHA-1: 40cfb1276bbe639777772225f5d971478bb4feb6 SHA-256: d72f98af65c357f9a3f9009f715b8de43c4ec02745a6e12433cd904027a47759
154 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics, including PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM, indicating it contains numerous links to potentially malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document body contains text related to BTS lyrics, likely a lure to disguise the malicious intent of the embedded link farm.

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=bts+love+yourself+answer+seesaw+lyrics
    • http://files.pebblehurst.com/uploads/1/3/1/4/131482826/6345087.pdf
    • http://xafoteba.johnsonycc.com/uploads/1/3/0/7/130776031/7422dc52767510.pdf
    • http://files.100alicestories.com.au/uploads/1/3/1/6/131606094/kugegixib.pdf
    • https://cdn.shopify.com/s/files/1/0431/0423/9783/files/2177182004.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3106/files/mebijotiw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/satofekefekuwozavobijogut.pdf
    • https://cdn.shopify.com/s/files/1/0440/7692/5078/files/tedojeti.pdf
    • https://cdn.shopify.com/s/files/1/0439/0250/1016/files/write_about_yourself_example.pdf
    • https://cdn.shopify.com/s/files/1/0433/2093/4558/files/misakiwakizegafumusovuluw.pdf
    • https://cdn.shopify.com/s/files/1/0429/8866/7039/files/fajakidenipe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mupuxisupevijerabufogete.pdf
    • https://cdn.shopify.com/s/files/1/0430/6613/0593/files/15905341663.pdf
    • https://cdn.shopify.com/s/files/1/0439/4074/1275/files/javascript_code_to_stop_form_submission.pdf
    • https://cdn.shopify.com/s/files/1/0431/2973/3282/files/91076622707.pdf
    • https://cdn.shopify.com/s/files/1/0430/7304/4642/files/55549352546.pdf
    • https://cdn.shopify.com/s/files/1/0438/2975/6066/files/9302431774.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_off0000612a.bin
78b5b64cb5380d89f2ffef0364ef148f9b18f2e7dffe2a87dfc0e12b35691854		 pdf-font-stream PDF embedded font (sfnt) at offset 0x612A 5060 bytes
font_01_sfnt_off0000728c.bin
b24fed5cb3cdc43a70d87ae5eafa6120c23bd034e1450f4c5cdc8a16ce53a4de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x728C 13772 bytes
font_02_sfnt_off00009d0f.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D0F 4324 bytes

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