Malicious PDF — malware analysis report

Static analysis result for SHA-256 69ac6bfa7c7fbbe9…

MALICIOUS

PDF

36.6 KB Created: 2020-08-17 07:39:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4974f21c8ed1fb063c67f12dd81ee79b SHA-1: 8c251a146ea3a2c47c0b897d674ae45779f3d9e7 SHA-256: 69ac6bfa7c7fbbe948a57b37dff31e592b03ec11753d46fe614f46b681341998
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains URLs that appear to be part of a link farm designed to attract traffic. This suggests the primary goal is to redirect users to potentially harmful websites.

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.ru/pify?keyword=standards+guidelines+electroplated+plastics
    • http://files.antiquecues.com/uploads/1/3/1/0/131070230/zunutuwip.pdf
    • http://lurigina.dowbydesign.com/uploads/1/3/0/7/130739723/kefipuwasemulin.pdf
    • http://files.goodtimesatlanta.com/uploads/1/3/2/6/132695662/1912e73c17ee4de.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0447/2268/4058/files/structural_isomers_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/8266/1526/files/gefifokajubowebitefe.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/rapidex_english_speaking_course_bangla.pdf
    • https://cdn.shopify.com/s/files/1/0435/1652/6752/files/business_english_grammar_test.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6982/files/gejarulofamivex.pdf
    • https://cdn.shopify.com/s/files/1/0430/7881/1797/files/libros_de_ansiedad_en_nios.pdf
    • https://cdn.shopify.com/s/files/1/0431/1403/7397/files/wunagigutuwifafiwozo.pdf
    • https://cdn.shopify.com/s/files/1/0430/0803/2922/files/song_obak_chader_aloy.pdf
    • https://cdn.shopify.com/s/files/1/0430/5253/1869/files/vodifono.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_off00004fc5.bin
caf12d711c53fcf3cf514838691d2c1d641b055423f95f02d7daf95e942816fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x4FC5 5344 bytes
font_01_sfnt_off000061f0.bin
795f72bef4eceba4b3688b061003a8426ef5888afe3089c0e3d0a7f499dddcc9
pdf-font-stream PDF embedded font (sfnt) at offset 0x61F0 10572 bytes