Malicious PDF — malware analysis report

Static analysis result for SHA-256 70502715ddce885d…

MALICIOUS

PDF

45.3 KB Created: 2020-07-20 06:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 7841ceac40ce62420ebae6caa773feca SHA-1: 5848dad89acc9f9ac795b117e3ae5404169b60c2 SHA-256: 70502715ddce885d327e778647fca3ff4f3169f5c499203d045da0a6ca2acb65
194 Risk Score

Malware Insights

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

The PDF file contains numerous links to external PDF files, many of which are hosted on SEO-optimized domains. The primary lure appears to be a fake download link for 'Thomas calculus 12th edition textbook pdf download', which redirects to a malicious URL. This suggests a phishing or scam campaign designed to trick users into downloading potentially 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=thomas%20calculus%2012th%20edition%20textbook%20pdf%20download In PDF document text
    • http://files.okto8online.com/uploads/1/3/0/7/130776682/juluko-zubofog.pdfIn PDF document text
    • http://files.amazingdownunder.com/uploads/1/3/2/7/132712206/bezulozobufij.pdfIn PDF document text
    • http://files.stitchwise.com/uploads/1/3/1/3/131379761/2051700b.pdfIn PDF document text
    • http://files.the-westwood-wire.info/uploads/1/3/1/4/131410299/a37598762f.pdfIn PDF document text
    • http://files.bethebestvolleyball.com/uploads/1/3/1/3/131398406/89ec32f570dc.pdfIn PDF document text
    • http://files.chestnuthouse1884.com/uploads/1/3/1/4/131438758/rafusexixulima-xikogoso.pdfIn PDF document text
    • http://files.bismarckdetailing.com/uploads/1/3/1/8/131871951/buwaro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://geditoka.files.wordpress.com/2020/07/sezadigudadovigotom.pdfIn PDF document text
    • https://woxaxivebaj.files.wordpress.com/2020/07/zudigid.pdfIn PDF document text
    • https://birodavubive.files.wordpress.com/2020/07/kelejemerorikew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/3196/2535/files/12226197943.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8929/7568/files/46572022042.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2266/3325/files/51156932819.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8389/0850/files/zoxasiwubugu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58143530911.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2825/0781/files/64276060103.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2974/2246/files/37314228938.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3645/8654/files/rezevebafaximexeluvilatid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0936/6427/files/bagatolopedabiwolepupazit.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 8

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_off000071ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71EE 5680 bytes
SHA-256: 2fb0657ae9e4a4e3db4d8937bfd897253358804457a2b36aa224f74fbe9d5425
font_01_sfnt_off00008530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8530 10048 bytes
SHA-256: 97db0538725f44374cac4a28d3d2739d9349fed8fe953368e7cc73afd51f9b74

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