Malicious PDF — malware analysis report

Static analysis result for SHA-256 671f1d6d3e3c9b88…

MALICIOUS

PDF

68.6 KB Created: 2020-08-01 22:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 303b44e448dc57fbea371d3bfd9f01b9 SHA-1: f423637af3a134a16a30d20165f9538f86d8799c SHA-256: 671f1d6d3e3c9b8882274ea63c94cec200d3aebac6350bcad9b91cf67848d23a
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to a "premium account" and the malicious URL. The PDF_SEO_LINK_FARM heuristic suggests the PDF is part of a larger link farm designed to distribute 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.com/pify?keyword=downloadani.+me+premium+account
    • http://files.speakingofveganfood.com/uploads/1/3/0/7/130738836/89634825136cd.pdf
    • http://files.pearlpartypalooza.com/uploads/1/3/1/4/131437330/880f66cf8158.pdf
    • http://files.rsmpdsg.com/uploads/1/3/2/6/132680986/81104.pdf
    • http://files.true-ink.org/uploads/1/3/2/6/132695302/5649105.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6175/5560/files/ropugodonoziwixafefimes.pdf
    • https://cdn.shopify.com/s/files/1/0433/4193/8856/files/rorojapawom.pdf
    • https://cdn.shopify.com/s/files/1/0430/9575/2864/files/negabonobones.pdf
    • https://cdn.shopify.com/s/files/1/0437/0300/9430/files/21682659338.pdf
    • https://cdn.shopify.com/s/files/1/0437/4809/8209/files/98124530431.pdf
    • https://cdn.shopify.com/s/files/1/0433/9888/9635/files/46930950978.pdf
    • https://cdn.shopify.com/s/files/1/0430/5541/5445/files/xuwufetanowemawuzeni.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/41964307083.pdf
    • https://cdn.shopify.com/s/files/1/0430/9437/6605/files/11232714944.pdf
    • https://cdn.shopify.com/s/files/1/0431/3546/7669/files/neritoroluvekoru.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/76908547682.pdf
    • https://cdn.shopify.com/s/files/1/0429/9735/0554/files/pefiwowidu.pdf
    • https://cdn.shopify.com/s/files/1/0438/2290/7554/files/xagokirawebomemalajixiwol.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad07.bin
3823f4c7fa9f757bc6bd88f193793638470dfe37dd9475ae43ee16a7915fbde5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD07 5164 bytes
font_01_sfnt_off0000be9d.bin
ee52bebc843303748af513d5fbd1d290934e84648492651dab54c059ebe486ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE9D 15160 bytes
font_02_sfnt_off0000ee01.bin
fff8b70d67420864e2a263fdbbaad35efae781e73a516d3cf38207748e8715b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE01 16088 bytes

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