Malicious PDF — malware analysis report

Static analysis result for SHA-256 1084a5eb94b9b7af…

MALICIOUS

PDF

47.4 KB Created: 2020-07-14 07:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 6643579e1a888205649c0ba1d76330db SHA-1: 12079e8794ae41c0ad3854742ff349f606b1bee9 SHA-256: 1084a5eb94b9b7afcebf533880dfdbe43131aaa045ff440f30473967b5c06202
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, suggests a lure related to PDF manipulation tools. The ML classifier strongly indicates maliciousness, and the presence of a malicious redirector URL confirms the intent to lead users to harmful content.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/wb?keyword=dividir%20de%20pdf%20online%20gratis In PDF document text
    • http://files.anncarragher.com/uploads/1/3/0/8/130814066/397160.pdfIn PDF document text
    • http://files.animalfineart.co.uk/uploads/1/3/0/9/130969965/muxeru.pdfIn PDF document text
    • http://files.cherrywoodadventures.co.uk/uploads/1/3/1/3/131384567/8571882.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://liwaraga.files.wordpress.com/2020/07/fexexajakidikunotoso.pdfIn PDF document text
    • https://felorige.files.wordpress.com/2020/06/zuvifu.pdfIn PDF document text
    • https://nanesufated.files.wordpress.com/2020/06/71945061391.pdfIn PDF document text
    • https://bomixifago.files.wordpress.com/2020/06/65012091345.pdfIn PDF document text
    • https://vatudim.files.wordpress.com/2020/07/rixafatabaserot.pdfIn PDF document text
    • https://ririrowibafa.files.wordpress.com/2020/06/27697442006.pdfIn PDF document text
    • https://tumezup.files.wordpress.com/2020/07/sevipisolotedima.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8380/9439/files/mapeva.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51106899687.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lezoxaxus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7922/8837/files/56953994935.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/womosoravitixugefiwil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80789229335.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75901524911.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000798e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x798E 5056 bytes
SHA-256: a56d0e56d5f3817550aa4d8b6ef8e58c894a06e3067a83e88a8b2758615b4a66
font_01_sfnt_off00008ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AD7 11432 bytes
SHA-256: 247fa6d07e464805bb89a658c9484e93dd718eefa01a65bc9987c45fed75703e

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