Malicious PDF — malware analysis report

Static analysis result for SHA-256 0274f6b0977fef82…

MALICIOUS

PDF

39.7 KB Created: 2020-08-08 09:35:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f93a7d326fcd3e4a607419fd05a1ff9a SHA-1: 3f3d6cf28126b2a5002c60b2e210f6de54996b35 SHA-256: 0274f6b0977fef8282c1b7cb1e82fa2cf06615defd38c73f3f035d7d0b1fcdfc
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one heuristic specifically identifying a link to known malicious redirector infrastructure. The document body also contains the malicious URL, suggesting an attempt to disguise malicious content as a legitimate PDF download. The ML classifier strongly indicates maliciousness, and the presence of many external links points towards SEO spam or a phishing lure.

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.ru/pify?keyword=augmented+reality+pdf+download
    • http://lesisax.maidonthemoonstainedglass.com/uploads/1/3/1/3/131384429/zutefi_feduxizuk_sotanutijivolix.pdf
    • http://files.judicheco.com/uploads/1/3/1/6/131607712/9605056.pdf
    • http://files.thepatchkennel.com/uploads/1/3/2/7/132740541/vimikirero.pdf
    • http://files.koolartclub.co.nz/uploads/1/3/1/3/131379277/pifomete.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/74535711799.pdf
    • https://cdn.shopify.com/s/files/1/0437/6811/9453/files/24787888761.pdf
    • https://cdn.shopify.com/s/files/1/0435/4742/6965/files/pawokofaxufarazebo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gekisemegudifusoledo.pdf
    • https://cdn.shopify.com/s/files/1/0428/5290/9212/files/rockland_journal_news_police_blotter.pdf
    • https://cdn.shopify.com/s/files/1/0430/1075/2663/files/levudopo.pdf
    • https://cdn.shopify.com/s/files/1/0436/4537/0518/files/amalgamation_of_partnership_firms.pdf
    • https://cdn.shopify.com/s/files/1/0434/8634/7414/files/aston_martin_logo_png.pdf
    • https://cdn.shopify.com/s/files/1/0429/8860/1503/files/gegazomuxubidobizaxuw.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8333/files/26369954368.pdf
    • https://cdn.shopify.com/s/files/1/0433/6451/5994/files/fowekejujomamux.pdf
    • https://cdn.shopify.com/s/files/1/0427/9461/4940/files/podenamu.pdf
    • https://cdn.shopify.com/s/files/1/0438/0341/0593/files/10267272866.pdf
    • https://cdn.shopify.com/s/files/1/0435/1485/5583/files/yaskawa_a1000_manual_free_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e2e.bin
b5c021f9c4cdc91934b176bf89de5079cd05da3b49a7e60e695dd9dd3e784f9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E2E 5248 bytes
font_01_sfnt_off00006004.bin
b7499421d253bd58710b64c4f607c5b722ec77c737b1610d1338d3de4ef68385		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6004 10428 bytes
font_02_sfnt_off000083a6.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83A6 4324 bytes

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