Malicious PDF — malware analysis report

Static analysis result for SHA-256 0881a48c475b8d20…

MALICIOUS

PDF

47.7 KB Created: 2020-07-13 16:40:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 23e74f338d84a34a61ee8bef6c131246 SHA-1: c7f069bba7c2304286a08a63796e02555d4f1664 SHA-256: 0881a48c475b8d20725f62a79f17d6cc283853d51292e75002215b413f7fa7eb
194 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as search results for a specific book, likely to trick users into downloading malicious content. The primary redirector URL is identified as malicious infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lead users to malicious sites, potentially for further exploitation.

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.ru/wb?keyword=alain%20de%20botton%20consolations%20of%20philosophy%20pdf In PDF document text
    • http://files.hopewellcompanies.com/uploads/1/3/1/0/131070485/be771c4b7f395b1.pdfIn PDF document text
    • http://files.omygoddess.com/uploads/1/3/1/6/131636862/19096a962e8.pdfIn PDF document text
    • http://files.nomadicsteve.com/uploads/1/3/1/4/131437538/42cb4690f8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3549/2503/files/61867032839.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2408/9242/files/mapezusedisusiro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4828/8935/files/pobufosegavekinevivobowus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lufixupiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0921/1557/files/91060691094.pdfIn PDF document text
    • https://dibababisiva762007800.files.wordpress.com/2020/06/90073144530.pdfIn PDF document text
    • https://rawosevatati.files.wordpress.com/2020/06/27044322975.pdfIn PDF document text
    • https://sovujegazof.files.wordpress.com/2020/06/zagasatevixerara.pdfIn PDF document text
    • https://ranosadimo.files.wordpress.com/2020/07/widubuliv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57148414383.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1769/9477/files/83461878762.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8158/1209/files/23765914192.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3526/3130/files/6492730329.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8400/5032/files/vobolurelesadanirurex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/94323725826.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6797/4556/files/30397729892.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xedatojif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/26443777516.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4891/9459/files/kikunexufanelej.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CF7 5168 bytes
SHA-256: 01fb5cb464d340fec16bd926cb44b3e60b3d4c2758bfacccb4d04753016f3a3c
font_01_sfnt_off00008e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E83 10052 bytes
SHA-256: 6ffbd7edd25348e4935ffa7e724fa6a68e906cba7ff4170cb2ddb473e82160f7