Malicious PDF — malware analysis report

Static analysis result for SHA-256 64881f939f0b87c6…

MALICIOUS

PDF

41.8 KB Created: 2020-08-20 03:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7aa0a386de33656e468ac1c8563ee52 SHA-1: 3289efcd6669c24f9b643cec796c3c794739cf0b SHA-256: 64881f939f0b87c6b9ac8a51a8a21b75e526cc737992557a4a574fe54e7e7108
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=100+linen+sheets+nz'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many of which are hosted on Shopify. The ML classifier strongly indicates maliciousness, suggesting the primary goal is to lure users to malicious infrastructure.

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=100+linen+sheets+nz
    • http://files.derekkalp.com/uploads/1/3/1/8/131856331/5eea1a8c745d486.pdf
    • http://dekif.omahavirtualschool.org/uploads/1/3/1/1/131164239/ebe98710a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/3120/5787/files/16092563633.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bixebor.pdf
    • https://cdn.shopify.com/s/files/1/0435/7862/2111/files/disney_beauty_and_the_beast_jr_musical_script.pdf
    • https://cdn.shopify.com/s/files/1/0433/0084/7781/files/gimp_user_manual_2._8.pdf
    • https://cdn.shopify.com/s/files/1/0437/5206/3125/files/59764486023.pdf
    • https://cdn.shopify.com/s/files/1/0428/6028/2023/files/64112149303.pdf
    • https://cdn.shopify.com/s/files/1/0428/0965/5462/files/adobe_illustrator_10_windows_xp_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/9619/3686/files/proyecto_aguacate_hass.pdf
    • https://cdn.shopify.com/s/files/1/0436/1610/8701/files/negerezisuxabaxorubozig.pdf
    • https://cdn.shopify.com/s/files/1/0437/7139/6257/files/fananadijenodisamozeni.pdf
    • https://cdn.shopify.com/s/files/1/0432/8289/0918/files/ielts_general_writing_task_2_samples_with_answers.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_off000065d7.bin
e5341884863e438d397b101a544c488691dccb2dd6680222ead9c5a359c202a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x65D7 4616 bytes
font_01_sfnt_off00007589.bin
effc0bb5e6460115965ac9c4de4388fd352843c3ebed9b85ed9570ff2d5acd67
pdf-font-stream PDF embedded font (sfnt) at offset 0x7589 10984 bytes