Malicious PDF — malware analysis report

Static analysis result for SHA-256 1117a488c2fd343f…

MALICIOUS

PDF

43.2 KB Created: 2020-08-04 09:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9702bf9ccc7c4f4c973d1cbde35509ec SHA-1: 4b98ced26ad539c3ad13326100124f39da109ddd SHA-256: 1117a488c2fd343f2952c8b8d92c7e4adbe182b5894caf8dda0f8d733009d5d3
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text that appears to be a lure for the malicious link. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of malicious links suggests an attempt to redirect the user to a harmful 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.cc/pify?keyword=first+aid+meaning+pdf
    • http://files.uniqorner.com/uploads/1/3/1/3/131384301/2662227.pdf
    • http://files.hughespropertymaintenance.co.uk/uploads/1/3/1/4/131453595/f38c5.pdf
    • http://files.trustworthylegalservices.com/uploads/1/3/1/6/131637570/pozoz.pdf
    • http://files.dodoskinblog.com/uploads/1/3/0/8/130874338/4a89f4a7087ab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6334/4294/files/ultimate_board_prep.pdf
    • https://cdn.shopify.com/s/files/1/0433/5943/6968/files/66627594142.pdf
    • https://cdn.shopify.com/s/files/1/0433/4046/4281/files/vinetapiwefo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0076/files/garuxagotijanigetumizoku.pdf
    • https://cdn.shopify.com/s/files/1/0432/7417/4622/files/fiselekamoxorenid.pdf
    • https://cdn.shopify.com/s/files/1/0429/1353/0019/files/buzawitibuxa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6423/7992/files/kapazawunages.pdf
    • https://cdn.shopify.com/s/files/1/0431/8520/9506/files/metubodakited.pdf
    • https://cdn.shopify.com/s/files/1/0430/4230/8250/files/29155971122.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/zivugobij.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_off00006c5c.bin
7c76bf4fbed933420ae658eac49174931632129581932338ea008ebb2299c51c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C5C 5284 bytes
font_01_sfnt_off00007e46.bin
b6e3c94e3345d2f10aa1798090e8242d9e3735e175dc065ca3e7e27bb8fc0ec5
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E46 9928 bytes