Malicious PDF — malware analysis report

Static analysis result for SHA-256 03bb26ccb058b2a1…

MALICIOUS

PDF

42.8 KB Created: 2020-08-04 23:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 117e5353f7e136fde5de9dee9bfa3897 SHA-1: 75dd7217d2cee42736e3c32537047c2416817b85 SHA-256: 03bb26ccb058b2a151447932e32aeab78e8925d772b3d909980915c304f6dc02
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to redirectors or algorithmically generated URLs, suggesting a link farm or SEO poisoning attack. The document body itself contains a URL that leads to a known malicious redirector, indicating an attempt to direct users to malicious content. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

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.ru/pify?keyword=books+to+read+online+free+pdf
    • http://files.collaborativenursingnetworknepa.com/uploads/1/3/2/6/132695418/5306601.pdf
    • http://files.kelmaraircraftsales.com/uploads/1/3/0/7/130775393/3404999.pdf
    • http://files.arcadewednesday.co.uk/uploads/1/3/0/7/130739375/a2066.pdf
    • http://files.hawksfalcon.com/uploads/1/3/1/6/131606179/d32aba6f9.pdf
    • http://files.funkyogaonline.com/uploads/1/3/1/3/131398194/gadusabarokali.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/1203/7540/files/abscesos_perianales_tratamiento.pdf
    • https://cdn.shopify.com/s/files/1/0433/3830/1594/files/kubota_l2500_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/7398/4919/files/2606771758.pdf
    • https://cdn.shopify.com/s/files/1/0431/0728/7206/files/rejumaxom.pdf
    • https://cdn.shopify.com/s/files/1/0429/8558/6849/files/74424721224.pdf
    • https://cdn.shopify.com/s/files/1/0440/4248/5910/files/96417836476.pdf
    • https://cdn.shopify.com/s/files/1/0435/8507/7405/files/meriki.pdf
    • https://cdn.shopify.com/s/files/1/0429/7388/8671/files/zarafeparedinupilapajaxe.pdf
    • https://cdn.shopify.com/s/files/1/0434/5731/4977/files/sigifusepodebup.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mojarugalemidim.pdf
    • https://cdn.shopify.com/s/files/1/0432/5359/6310/files/begiwitoreg.pdf
    • https://cdn.shopify.com/s/files/1/0430/1111/3123/files/melee_attack_5e.pdf
    • https://cdn.shopify.com/s/files/1/0429/4243/1395/files/94149160093.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_off00006ac7.bin
8464586d9440d43ead4e3f411fd3b9019e15f88140e6d1d8baa854deae7d8ce9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC7 5148 bytes
font_01_sfnt_off00007c5f.bin
588a0d4e4902d40de65d9ffd6ec2b7e4db673f331f04d17282afe173c953bee0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C5F 9956 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.