Malicious PDF — malware analysis report

Static analysis result for SHA-256 da3fc7d0e31623d0…

MALICIOUS

PDF

46.1 KB Created: 2020-08-08 20:26:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0805c76ed005ca49898b690623b8cc9d SHA-1: 3dde18dee3ca75c5b262d5708773c0e0eec774a7 SHA-256: da3fc7d0e31623d01ea07f93c2f2309aee150071c4b378d75adca30741a2ac3d
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious infrastructure, indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=healthcare+administration+and+management+pdf', suggesting a phishing or redirection attempt. The PDF_SEO_LINK_FARM heuristic further indicates a large number of external links, many hosted on cdn.shopify.com, which are likely part of a link farm to improve search engine ranking for malicious content.

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=healthcare+administration+and+management+pdf
    • http://files.fbcpas.net/uploads/1/3/1/6/131606762/6f47e.pdf
    • http://files.fenestraglazing.co.uk/uploads/1/3/0/8/130874210/noseg_kozorafat.pdf
    • http://fajogoji.bulldogcleaningandrestoration.com/uploads/1/3/1/6/131607163/metulazafejavix-xinemoduvi.pdf
    • http://files.pslhsband.com/uploads/1/3/1/4/131454304/nokikexizetibod.pdf
    • http://files.pawsrehab.net/uploads/1/3/0/8/130873958/suvatagetage_pukuzena_ziwikodo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6657/2443/files/babosikivuloni.pdf
    • https://cdn.shopify.com/s/files/1/0427/3196/2535/files/debimapopubavikid.pdf
    • https://cdn.shopify.com/s/files/1/0428/0179/1132/files/amazon_kindle_fire_hd_10_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/64717584995.pdf
    • https://cdn.shopify.com/s/files/1/0432/1630/6344/files/zukarixojojuse.pdf
    • https://cdn.shopify.com/s/files/1/0437/6258/1658/files/bridges_in_mathematics_kindergarten.pdf
    • https://cdn.shopify.com/s/files/1/0428/5225/3863/files/74471728980.pdf
    • https://cdn.shopify.com/s/files/1/0430/9028/0609/files/70039864401.pdf
    • https://cdn.shopify.com/s/files/1/0433/4452/7511/files/labejif.pdf
    • https://cdn.shopify.com/s/files/1/0439/2275/1643/files/56017989410.pdf
    • https://cdn.shopify.com/s/files/1/0432/2269/6096/files/juzezusipur.pdf
    • https://cdn.shopify.com/s/files/1/0434/2356/3925/files/nivuviduwobok.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32808714247.pdf
    • https://cdn.shopify.com/s/files/1/0432/3596/7143/files/59415456936.pdf
    • https://cdn.shopify.com/s/files/1/0433/6238/6079/files/58570358255.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_off0000753f.bin
04369b4ae475a27cf21312b68eead629d42e3c7bb3cce4877e962527a06699c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x753F 5528 bytes
font_01_sfnt_off000087dc.bin
0b4841da490b3181ead0480beb37027ad109e656b9220e53d6764becb97d49c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87DC 10240 bytes

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