Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7ded4af0b7af728…

MALICIOUS

PDF

37.3 KB Created: 2020-11-01 05:08:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: fce4bf5627ee20ae80aa25474c579fb8 SHA-1: 2b30f5d52cb989d2379ea50f1affd24d10ddf699 SHA-256: e7ded4af0b7af728a07e3f158f741381b81c6105ad0a198346f6b8bead6697fe
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link farm and redirects to malicious infrastructure, indicating a phishing or scam attempt. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector found by heuristics. The presence of numerous external PDF links suggests an attempt to manipulate search engine results for malicious purposes.

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.link/123?keyword=vollhardt+organic+chemistry+solutions+manual+pdf In PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/18596.pdfIn PDF document text
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/nepakupi-nozav-kikipunure-vazudimuridago.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/ncis_theme_song_guitar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/2077/0237/files/hindu_puran_bengali.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/las_brujas_de_eastwick.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/40108825101.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb991e21-3a2e-49be-b3e7-d34bfdb5767b/wejefudazabejipe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0508/1078/1854/files/14_leadership_traits.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/28942599818.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5873/6533/files/how_to_download_games_for_android_ppsspp.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/1592/1818/files/75143970146.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/bicycle_crossing_sign_means.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4537 4252 bytes
SHA-256: 80149f2c466594519747cefc51d4f3001f228a46288a9bde27cde9547f076fea
font_01_sfnt_off00005434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5434 5636 bytes
SHA-256: 77744bd3ff9c8e2cc508e16767eb19c6f56afc53d5878f1a2a9bdce48fe6d580
font_02_sfnt_off0000673d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x673D 9408 bytes
SHA-256: 71bbd836a20894dbb179fc48da76b2f3e5bb0fad21edc303ee9216009e900480

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