Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e193c966db3cf0c…

MALICIOUS

PDF

33.8 KB Created: 2020-08-19 02:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51017ddd03bf99cea38c98829396ef01 SHA-1: cafe2cd133d9ca32ee200010f70a7872803746b6 SHA-256: 0e193c966db3cf0cb3f9c39fe9745c158ab5ab89ff260e429936d4b4b72d791e
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, including a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a 'free download' of a 'balloon video song'. This suggests a phishing or scam attempt, likely leveraging the embedded links to redirect users to malicious sites. No scripts were extracted, but the PDF structure and link farm indicate malicious intent.

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=balloon+video+song+free
    • http://files.newworldexploration.com/uploads/1/3/1/3/131398547/2978364.pdf
    • http://files.stuphotoart.com/uploads/1/3/1/4/131409755/zexinevewar.pdf
    • http://files.campbellanderson.com/uploads/1/3/1/3/131381919/8790973.pdf
    • http://files.johnmccrea.co.uk/uploads/1/3/2/6/132695602/e138fb7cb368cc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2318/7616/files/30510635482.pdf
    • https://cdn.shopify.com/s/files/1/0428/2214/0070/files/data_analyst_interview_questions_and_answers_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/5019/6392/files/cognitive_dissonance_festinger.pdf
    • https://cdn.shopify.com/s/files/1/0433/7333/0586/files/endocrine_system_labeling_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0427/5362/2182/files/web_to_no_ads.pdf
    • https://cdn.shopify.com/s/files/1/0432/4678/0566/files/54660423108.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dutevitijenunolekegek.pdf
    • https://cdn.shopify.com/s/files/1/0429/0412/5599/files/nodixuraviwigafixavex.pdf
    • https://cdn.shopify.com/s/files/1/0431/6810/4602/files/2573472984.pdf
    • https://cdn.shopify.com/s/files/1/0434/5161/3334/files/jalugowugovipozetovo.pdf
    • https://cdn.shopify.com/s/files/1/0428/4294/7750/files/tomiv.pdf
    • https://cdn.shopify.com/s/files/1/0429/9236/9823/files/gakoxuvipakexekobafibepes.pdf
    • https://cdn.shopify.com/s/files/1/0435/5339/0743/files/chacha_chaudhary_online_comics.pdf
    • https://cdn.shopify.com/s/files/1/0437/6123/8168/files/toxiromo.pdf
    • https://cdn.shopify.com/s/files/1/0435/9503/8877/files/29951988758.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_off00004853.bin
400a49253c3c2b5cd456ed351b00959720b5c6700f9f5745827c1c89826a61dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4853 5184 bytes
font_01_sfnt_off00005a06.bin
f81575097520ce014a5734715e987e1ede4cfd104b2e28bf2d134b039e55af4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A06 9540 bytes

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