Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff118d3dbcf9dc9…

MALICIOUS

PDF

54.1 KB Created: 2020-08-17 04:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afab2512d5d09dd58291323efcb64c1c SHA-1: 87a579c94e1d1466fb9051b93b0d971c4a45653b SHA-256: 5ff118d3dbcf9dc9e45502b12371f51ca6db08c6ed354b9cdbdd8d77c1f4428a
154 Risk Score

Malware Insights

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

The PDF contains a lure for 'Java for Minecraft' and embeds a link to a redirector service, ttraff.cc, which is flagged as malicious. The document also contains a large number of links to other PDFs, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly indicates maliciousness, and the embedded URL heuristic confirms the presence of a malicious link.

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=java+for+minecraft+1.+7.+2
    • http://files.wildflower-herbs.com/uploads/1/3/0/7/130775506/1961027.pdf
    • http://files.morningsideunitedchurch.org/uploads/1/3/1/4/131406288/b6c549d76b9dd7f.pdf
    • http://files.rainbowfarmsmaine.com/uploads/1/3/1/4/131406274/75a56c6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/5106/3195/files/mugisokivalepakuli.pdf
    • https://cdn.shopify.com/s/files/1/0429/3971/1655/files/luzigilisimemiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/9599/0175/files/91956474158.pdf
    • https://cdn.shopify.com/s/files/1/0431/2452/3169/files/93032959737.pdf
    • https://cdn.shopify.com/s/files/1/0427/6014/3014/files/37021716580.pdf
    • https://cdn.shopify.com/s/files/1/0427/5293/4044/files/julian_date_calendar.pdf
    • https://cdn.shopify.com/s/files/1/0431/8488/1825/files/61191022204.pdf
    • https://cdn.shopify.com/s/files/1/0436/1653/4685/files/96799546454.pdf
    • https://cdn.shopify.com/s/files/1/0435/0866/2440/files/40246475841.pdf
    • https://cdn.shopify.com/s/files/1/0429/9515/5105/files/acknowledgement_for_training_project_report.pdf
    • https://cdn.shopify.com/s/files/1/0439/3864/4136/files/baby_crib_sheets_target.pdf
    • https://cdn.shopify.com/s/files/1/0434/4568/2328/files/collins_grammar_for_ielts_vk.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_off0000950a.bin
55b7b4af18ec36ca9a2af41b1390aa066b945a7ab7aab2f19d3740c5016b409f
pdf-font-stream PDF embedded font (sfnt) at offset 0x950A 5164 bytes
font_01_sfnt_off0000a6a1.bin
75ec2176b77630226a53be58aff07da07f7ece3ad494e820d073096cac8e62f4
pdf-font-stream PDF embedded font (sfnt) at offset 0xA6A1 10892 bytes