Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40f9a354125a4c9…

MALICIOUS

PDF

77.2 KB Created: 2020-08-16 13:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1d93c3732c8824188521847aa15e262 SHA-1: 8ee9d2d7d393705c37584b2cc765bf95a90763f8 SHA-256: b40f9a354125a4c97d9eadd660d265ceea9225e4081aa8a3ebd591b1f3ac692b
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to Shopify domains but are likely part of a link farm to improve SEO for malicious content. The primary heuristic firing indicates a direct link to a known malicious redirector at 'ttraff.com'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the primary malicious URL, suggesting a lure to a malicious site.

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.com/wb?keyword=poway%20bmp%20design%20manual
    • http://files.namiracinecounty.org/uploads/1/3/0/7/130776661/rugewatezanof.pdf
    • http://wifof.lisaloguebooks.com/uploads/1/3/2/6/132695531/munuxexemodojobiwolu.pdf
    • http://files.mtzionholychurchde.org/uploads/1/3/1/0/131070604/8116094.pdf
    • https://cdn.shopify.com/s/files/1/0433/9869/3013/files/kalnirnay_calendar_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/6656/4507/files/vivexegegoputegurugemoz.pdf
    • https://cdn.shopify.com/s/files/1/0427/9340/2534/files/36560202503.pdf
    • https://cdn.shopify.com/s/files/1/0430/5072/9634/files/normalidad_y_anormalidad_epidemiologia.pdf
    • https://cdn.shopify.com/s/files/1/0432/7899/1513/files/alfa_laval_purifier_overhaul.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lalosukiwafigoledexefes.pdf
    • https://cdn.shopify.com/s/files/1/0429/8362/0757/files/synonyms_for_common_words.pdf
    • https://cdn.shopify.com/s/files/1/0433/8175/1964/files/como_cambiar_de_a_word_en_mac.pdf
    • https://cdn.shopify.com/s/files/1/0430/7176/6690/files/89054136965.pdf
    • https://cdn.shopify.com/s/files/1/0432/5628/3296/files/dodizefap.pdf
    • https://cdn.shopify.com/s/files/1/0432/2862/7107/files/28342139892.pdf
    • https://cdn.shopify.com/s/files/1/0430/9712/9109/files/lupun.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_off0000f244.bin
80d3662e283dba43a712c2b2a2eeb1bcd4954673601f481154ec24330b494e8b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF244 5520 bytes
font_01_sfnt_off00010504.bin
3aa3d808389774b1f69afd3ee2e1746cfc9cf7d31bed36ec05a66404aac8c347
pdf-font-stream PDF embedded font (sfnt) at offset 0x10504 10256 bytes