Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cbda4c0bd8949a5…

MALICIOUS

PDF

36.1 KB Created: 2020-08-13 06:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ef713b876c5c4a3b3faaa9cd0ae556d SHA-1: 9cad9ae7b8475e46a28fc3b4e07d3e7fac965505 SHA-256: 5cbda4c0bd8949a59045b1ae25262ca777da5665f871354583d9620bc5cb9d2e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/pify?keyword=i+dreamed+a+dream+piano+accompaniment+pdf'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external PDF links, many of which are hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. These factors indicate a likely attempt to direct users to malicious content or phishing sites.

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=i+dreamed+a+dream+piano+accompaniment+pdf
    • http://files.honeyhopfarm.com/uploads/1/3/0/9/130969408/911abb.pdf
    • http://files.emmamagidart.com/uploads/1/3/0/8/130874134/9233772.pdf
    • http://files.tribalexperiences.com/uploads/1/3/1/3/131379743/xogolov-jebogudipigasaw-manubawokiwuza-sisubexajisenaf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/0451/0887/files/arabian_nights_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/1220/2389/files/81817548959.pdf
    • https://cdn.shopify.com/s/files/1/0427/6181/4172/files/52454021948.pdf
    • https://cdn.shopify.com/s/files/1/0431/6214/0840/files/59058744146.pdf
    • https://cdn.shopify.com/s/files/1/0437/0602/4101/files/sotafogijot.pdf
    • https://cdn.shopify.com/s/files/1/0431/6535/2093/files/teoria_da_argumentao_jurdica.pdf
    • https://cdn.shopify.com/s/files/1/0428/1538/9855/files/wogubedakejiduj.pdf
    • https://cdn.shopify.com/s/files/1/0428/5736/5670/files/1st_edition_dungeon_master_s_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/3909/6986/files/tekulizutokuxemavani.pdf
    • https://cdn.shopify.com/s/files/1/0432/1011/3188/files/vsepr_theory.pdf
    • https://cdn.shopify.com/s/files/1/0432/5654/5433/files/fusionner_2_en_1_seul.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_off00004f90.bin
ac1c36ada8a4de50ccbbcf49b2ae2df9a5983dc71ffa45b64204ab596b21fe89
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F90 5028 bytes
font_01_sfnt_off0000608d.bin
c0259382fc542aeeec13820cafdc90a9ade17a1e69c09521e28759a7758be4e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x608D 10456 bytes