Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ceeb1ff80a0f30d…

MALICIOUS

PDF

45.4 KB Created: 2020-08-22 09:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3062602173d944fcbb6159490178db46 SHA-1: 9d5d0e560e43c5a5ab772c35af505651ae6916bb SHA-256: 6ceeb1ff80a0f30d25fc01ee11e08ba500e358cd271ebdc183f0bcfabe82077e
194 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, disguised with text related to cloud formation policies. The PDF also contains a large number of external PDF links, many of which are algorithmically generated, suggesting a link farm or SEO poisoning attempt. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or redirection attack.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=cloudformation+s3+bucket+policy+examples
    • http://files.manilges.com/uploads/1/3/1/0/131070379/witegiwud.pdf
    • http://files.wpbchiropractor.com/uploads/1/3/0/8/130874347/98fd4d2b2a9.pdf
    • http://files.uprisingstarsinc.org/uploads/1/3/1/3/131379045/gowofikur.pdf
    • http://files.missmatchmakerlive.com/uploads/1/3/0/7/130738559/6774517.pdf
    • http://files.professionalorganizercolumbusohio.com/uploads/1/3/1/4/131437322/6246459.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/8130/9085/files/f_b_service_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/2914/2426/files/xumewafowakomiv.pdf
    • https://cdn.shopify.com/s/files/1/0429/3351/8489/files/kuzuviminibajumuf.pdf
    • https://cdn.shopify.com/s/files/1/0434/0695/0557/files/zorevenam.pdf
    • https://cdn.shopify.com/s/files/1/0428/4976/3494/files/biblical_canon.pdf
    • https://cdn.shopify.com/s/files/1/0464/5050/7944/files/junefasoxum.pdf
    • https://cdn.shopify.com/s/files/1/0447/0459/6122/files/carmina_burana_vocal_score_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/5042/6787/files/barium_enema_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0431/7180/7394/files/tinkers_construct_add_modifiers.pdf
    • https://cdn.shopify.com/s/files/1/0428/5746/3964/files/74906945057.pdf
    • https://cdn.shopify.com/s/files/1/0429/4334/8892/files/59960376854.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000674c.bin
d03ab9da667e3844002b6aaa710f3a4f54533714ae1bb95eb97000696f4add06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x674C 5744 bytes
font_01_sfnt_off00007ac4.bin
fbb2eec9097ab18919bdb1e89e28a342d16cd07adcd2d8c2b94562837f64caca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AC4 14748 bytes

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