Malicious PDF — malware analysis report

Static analysis result for SHA-256 664235bc7d9c048f…

MALICIOUS

PDF

36.5 KB Created: 2020-08-11 22:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb4e1d40d1197afb070f768ac7c1b31c SHA-1: b5cb83f6084372165cc2be702dd7730124935aca SHA-256: 664235bc7d9c048f2a9ca968334a76aa4f9335c30a34976b8fc1776ad748bcea
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 a redirector known for malicious activity. The document body, though obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=sisters+white+christmas+sheet+music+pdf+free', suggesting a lure to a malicious site. The ML classifier also strongly indicated maliciousness.

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=sisters+white+christmas+sheet+music+pdf+free
    • http://files.angiezinserphotography.com/uploads/1/3/1/6/131607866/duledelewununiper.pdf
    • http://files.falinzhang.com/uploads/1/3/0/9/130969206/6000992.pdf
    • http://files.cookislandsoptometrist.com/uploads/1/3/1/6/131607029/186d53c3b68079.pdf
    • http://files.corsettiparalegal.com/uploads/1/3/1/6/131636692/8563576.pdf
    • http://files.iseil.org/uploads/1/3/1/3/131380397/fanajijosis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vemuvuferakodumi.pdf
    • https://cdn.shopify.com/s/files/1/0439/4654/1211/files/j_ai_saign_blaise_cendrars.pdf
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/29808376554.pdf
    • https://cdn.shopify.com/s/files/1/0430/6495/0945/files/vilulabonozuwumipigegotix.pdf
    • https://cdn.shopify.com/s/files/1/0434/4155/3575/files/mufradat_al_quran_english.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7100/files/anthropological_theory.pdf
    • https://cdn.shopify.com/s/files/1/0431/2317/9677/files/jasawelotopebemolelatudur.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/pellegrino_artusi_libro.pdf
    • https://cdn.shopify.com/s/files/1/0435/9376/0931/files/sahih_al_bukhari_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/7512/5919/files/john_deere_870_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/5520/0918/files/nupuzoxalinivozexoxifu.pdf
    • https://cdn.shopify.com/s/files/1/0435/2904/4119/files/64412333860.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gujogu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8558/6849/files/wiraguguvusewazumo.pdf
    • https://cdn.shopify.com/s/files/1/0437/2260/4695/files/nusajufapipubegekod.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_off00004d5c.bin
873363883082bd4413a1686891992f502aa3b7534f607fd0625b1a70b613ed37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D5C 5560 bytes
font_01_sfnt_off0000602a.bin
1322541e92b18c6a69c97bdc7cc268f4b99ed4f07b7737e3ac8d3b61fd4e62df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x602A 10124 bytes

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