Malicious PDF — malware analysis report

Static analysis result for SHA-256 6989bb82ed6f1aac…

MALICIOUS

PDF

42.6 KB Created: 2020-08-19 07:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a889fb909ff20f639e0b9c29266d6ed SHA-1: 111c2d12f828389d8bed18ac118c856115146e9b SHA-256: 6989bb82ed6f1aaccbad34feb3fc6f244394ad9398891670b513b97ed9d4b299
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, forming a link farm, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the redirector link. This suggests an attempt to drive traffic to malicious sites, likely for further exploitation or phishing. No scripts were extracted, but the presence of embedded URLs and the link farm heuristic strongly indicate a malicious intent.

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=airserver+alternative+for+android
    • http://files.eeebray.com/uploads/1/3/1/6/131637889/b1e1df.pdf
    • http://files.studiocanvas.org/uploads/1/3/0/7/130739747/aea07.pdf
    • http://files.maidtoshineservices.net/uploads/1/3/1/4/131437268/29f33e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0508/3811/files/ranuleginidutinu.pdf
    • https://cdn.shopify.com/s/files/1/0434/9578/4600/files/gewabakumir.pdf
    • https://cdn.shopify.com/s/files/1/0439/5322/5883/files/online_booking_system_thesis.pdf
    • https://cdn.shopify.com/s/files/1/0429/7061/1861/files/5589223840.pdf
    • https://cdn.shopify.com/s/files/1/0438/8470/7992/files/95480563525.pdf
    • https://cdn.shopify.com/s/files/1/0431/3939/9842/files/vadetulesijebobugugaku.pdf
    • https://cdn.shopify.com/s/files/1/0428/7699/3702/files/calum_von_moger_ebook.pdf
    • https://cdn.shopify.com/s/files/1/0437/9059/8305/files/back_button_app_for_samsung.pdf
    • https://cdn.shopify.com/s/files/1/0429/8942/0695/files/throat_clearing_sound_crossword_answer.pdf
    • https://cdn.shopify.com/s/files/1/0433/9249/9877/files/auto_repair_books.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_off00006b4a.bin
c830e305bb9b63f47a68d64fc1124f3e91d1bfa02530aded665a34cd88ede5f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B4A 4948 bytes
font_01_sfnt_off00007c29.bin
cca92e7e9e6cf0cdfb057fa53540bcc007bfbe8e16284221fbf44e720f9fcec0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C29 9728 bytes