Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c6a17bd7e3b239a…

MALICIOUS

PDF

39.7 KB Created: 2020-08-21 22:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05d73629d9f31701698d49c430e41644 SHA-1: 57fadff9fc650a068e72f9072fb71ceded1fb0cb SHA-256: 4c6a17bd7e3b239ac7ca0667033ae4e1f3e91bbfb749aca46a18fd989a380c44
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/pify?keyword=botim+apk+old+version'. Additionally, it exhibits characteristics of a PDF link farm, with numerous links to external PDFs hosted on domains like cdn.shopify.com. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same redirector URL, suggesting the primary intent is to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.com/pify?keyword=botim+apk+old+version
    • http://balasone.gogebiccd.org/uploads/1/3/1/4/131405927/c4a7e1.pdf
    • http://files.blockhashpodcast.com/uploads/1/3/2/6/132696117/fojizu.pdf
    • http://files.hyuk.info/uploads/1/3/0/8/130874431/278624.pdf
    • http://files.zip-dang.com/uploads/1/3/1/3/131383664/gadizubobowow_kufusu.pdf
    • https://cdn.shopify.com/s/files/1/0429/4849/3475/files/68869925590.pdf
    • https://cdn.shopify.com/s/files/1/0431/0463/2992/files/agile_scrum_ebook.pdf
    • https://cdn.shopify.com/s/files/1/0429/8145/8069/files/koxilevubajelodukira.pdf
    • https://cdn.shopify.com/s/files/1/0438/8149/6744/files/68660554902.pdf
    • https://cdn.shopify.com/s/files/1/0429/1792/0934/files/thousand_miles_piano_sheet_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2132/files/merodisujil.pdf
    • https://cdn.shopify.com/s/files/1/0432/0965/4432/files/35120225955.pdf
    • https://cdn.shopify.com/s/files/1/0429/5363/8044/files/18766692723.pdf
    • https://cdn.shopify.com/s/files/1/0435/2563/6248/files/bumimeg.pdf
    • https://cdn.shopify.com/s/files/1/0437/5330/8314/files/xakupibuta.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/23083433767.pdf
    • https://cdn.shopify.com/s/files/1/0428/8167/9523/files/viwofomozosusafogira.pdf
    • https://cdn.shopify.com/s/files/1/0437/6199/1841/files/45536198859.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000562f.bin
d0b2867d788f382aa27d5b58405d35d9810d82dd7d5ec8132ba9ef06f86f4b51
pdf-font-stream PDF embedded font (sfnt) at offset 0x562F 5276 bytes
font_01_sfnt_off0000680c.bin
7f267bc1550bb901cc477181f17b5594b1a29c50ee1be1c80784c5eeca1f7476
pdf-font-stream PDF embedded font (sfnt) at offset 0x680C 13360 bytes