Malicious PDF — malware analysis report

Static analysis result for SHA-256 05de3eef44372d6f…

MALICIOUS

PDF

39.5 KB Created: 2020-08-08 17:40:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24093bbd83fec873fec180d50c923038 SHA-1: f14cf33defc285d9889decb1c6c881e385ef69d6 SHA-256: 05de3eef44372d6f5bd155f69e93138fadb596ab01939fdf229dd0c2dcf1e323
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific malicious redirector URL, indicating an attempt to drive traffic to potentially harmful sites. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure for downloading lyrics, which is a common social engineering tactic. The ML classifier strongly flagged this PDF as malicious.

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=bekhayali+lyrics+pdf+download
    • http://files.nspirehomesolutions.com/uploads/1/3/1/4/131406412/jasov.pdf
    • http://files.joyspringseternal.com/uploads/1/3/1/8/131856232/5623189.pdf
    • http://files.bookbrokers1.com/uploads/1/3/2/7/132741241/zawasoje.pdf
    • http://files.pontolaketownship.com/uploads/1/3/1/8/131857419/sisewipe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/6953/6411/files/konudilanu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1707/5868/files/gold_s_gym_resistance_bands.pdf
    • https://cdn.shopify.com/s/files/1/0431/8376/7713/files/91642449123.pdf
    • https://cdn.shopify.com/s/files/1/0429/3351/8489/files/amphigorey_too.pdf
    • https://cdn.shopify.com/s/files/1/0436/8600/2838/files/93298687881.pdf
    • https://cdn.shopify.com/s/files/1/0429/7339/7145/files/44493113547.pdf
    • https://cdn.shopify.com/s/files/1/0427/6705/7063/files/bemegakanedavo.pdf
    • https://cdn.shopify.com/s/files/1/0432/7777/9100/files/38772583436.pdf
    • https://cdn.shopify.com/s/files/1/0430/6698/2561/files/91751854742.pdf
    • https://cdn.shopify.com/s/files/1/0428/7696/0924/files/74829439811.pdf
    • https://cdn.shopify.com/s/files/1/0434/8166/1600/files/2748331527.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_off00005b4f.bin
dbc0e6f6dcdffd1f30c60cb50640e840369fc490ae6dd38a039db1441c28ece2
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B4F 5552 bytes
font_01_sfnt_off00006e47.bin
d6f13244349259dd28b10e0596367360684bbf53fb44067a33e660eb4303186f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E47 10308 bytes