Malicious PDF — malware analysis report

Static analysis result for SHA-256 0daabb3e70ba6956…

MALICIOUS

PDF

44.3 KB Created: 2020-08-08 01:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c690749c7a78731018c38f7d95d10ddf SHA-1: cec5f483ea1b5c461dee9455bda7b704086f88ef SHA-256: 0daabb3e70ba69565aebf316a042570d113ddc5dd4ff5791f44f0dfc1d289376
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious or SEO-farmed content, including a known malicious redirector at ttraff.ru. The document body itself is heavily obfuscated but contains embedded URLs, suggesting an attempt to drive traffic to these external sites. The ML classifier strongly indicates maliciousness, supporting the conclusion that this PDF is designed to lead users to harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.ru/pify?keyword=generally+accepted+accounting+principles+definition+pdf
    • http://files.calvinmasculpts.com/uploads/1/3/0/7/130775223/xupojule.pdf
    • http://files.cocoamoy.co.uk/uploads/1/3/2/6/132682976/5933367.pdf
    • http://files.culturallyresponsivesustainedteaching.com/uploads/1/3/0/8/130874102/8549555.pdf
    • http://files.979wdmg.com/uploads/1/3/0/7/130775979/cf634dd3e9038.pdf
    • http://files.livshairandbeauty.com/uploads/1/3/0/7/130775352/6200347.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9058/3464/files/spider_man_into_the_spider_verse_coloring_pages.pdf
    • https://cdn.shopify.com/s/files/1/0432/3491/8558/files/47888641650.pdf
    • https://cdn.shopify.com/s/files/1/0432/3701/5719/files/rainbow_table_attack.pdf
    • https://cdn.shopify.com/s/files/1/0434/4178/2946/files/74323373287.pdf
    • https://cdn.shopify.com/s/files/1/0430/6409/8970/files/bugisozelosizokube.pdf
    • https://cdn.shopify.com/s/files/1/0432/4956/5853/files/gujixipexopivilujitawilim.pdf
    • https://cdn.shopify.com/s/files/1/0440/1774/6070/files/atlas_anatomy_human_body.pdf
    • https://cdn.shopify.com/s/files/1/0430/0944/1953/files/xibekuboruvejovedaja.pdf
    • https://cdn.shopify.com/s/files/1/0437/2175/2731/files/ape_author_publisher_entrepreneur.pdf
    • https://cdn.shopify.com/s/files/1/0439/2153/9240/files/portuguese_to_english_phrases.pdf
    • https://cdn.shopify.com/s/files/1/0434/0006/9283/files/93215865915.pdf
    • https://cdn.shopify.com/s/files/1/0436/4029/1486/files/10517160906.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_off00006dd7.bin
31837922d3c9fb712b4b22da5a8f7199d5b70aa2ada5b06d39f7578dbd2197dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DD7 5456 bytes
font_01_sfnt_off00008087.bin
c5c27c19f7ffd3b303c3b755cd216e4ce3de74a6c69f3c1055823404811f554a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8087 10360 bytes

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