Malicious PDF — malware analysis report

Static analysis result for SHA-256 675d6c80e528ff76…

MALICIOUS

PDF

41.9 KB Created: 2020-08-21 07:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 74e2f2eb737cf8bee5b1d6b6d30c6575 SHA-1: 56ff1f6dad841442bd7b46556e077bc6921d7dff SHA-256: 675d6c80e528ff76a5c51b5dc9b94a83b31da194ec980ffb2c664125bd7e62d5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or redirection strategy. One prominent URL, 'https://ttraff.cc/pify?keyword=brainwave+entrainment+app+android', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this same URL and other PDF links, indicating an attempt to lure users to malicious infrastructure under the guise of providing information.

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=brainwave+entrainment+app+android
    • http://files.nhfuneral.org/uploads/1/3/1/8/131856134/21f98aac5c3f8.pdf
    • http://xiwig.lifeislikevegetables.com/uploads/1/3/0/8/130874043/3732309.pdf
    • http://suxawud.7westproductions.com/uploads/1/3/0/7/130739560/302289.pdf
    • http://files.keysboatdocks.com/uploads/1/3/2/7/132712015/8512c1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/1310/2998/files/nafevavijapulaxopopu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8379/2545/files/discord_join_messages.pdf
    • https://cdn.shopify.com/s/files/1/0433/7506/7297/files/gepaseworu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1321/8199/files/75194912368.pdf
    • https://cdn.shopify.com/s/files/1/0440/8773/8533/files/jiginoxi.pdf
    • https://cdn.shopify.com/s/files/1/0437/5209/5898/files/tunajerulonafuxagokafusi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6579/2929/files/fobip.pdf
    • https://cdn.shopify.com/s/files/1/0437/6202/4605/files/business_meeting_agenda_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/6705/6023/files/tratamiento_angina_de_pecho.pdf
    • https://cdn.shopify.com/s/files/1/0450/7946/2040/files/gabby_bernstein_super_attractor.pdf
    • https://cdn.shopify.com/s/files/1/0433/1533/1227/files/37923737673.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006765.bin
51ab3952c6e6a40b59ab608d8326817e35e7e7eaf7a7005ae0d797c0af5c5469
pdf-font-stream PDF embedded font (sfnt) at offset 0x6765 5096 bytes
font_01_sfnt_off000078b4.bin
3d1c052be41a0acab7dc6c173e73a1b8e407b26e064d80f350da72d6b3dd358d
pdf-font-stream PDF embedded font (sfnt) at offset 0x78B4 10076 bytes