Malicious PDF — malware analysis report

Static analysis result for SHA-256 82cdca4d04226731…

MALICIOUS

PDF

44.6 KB Created: 2020-08-12 18:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 253e343749e202fb232eaf5f4fade7f4 SHA-1: 0ddda5d1c1b447c349c2c53a52db343c4649ef5c SHA-256: 82cdca4d042267317691bf4aae6c8c4748c73b63afe00c5fd929939af499cfe7
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 PDF files, suggesting a link farm or SEO manipulation tactic. One of the primary links directs to a known malicious redirector, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains a URL that mirrors the malicious redirector, reinforcing the 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=affairscloud+current+affairs+weekly+pdf
    • http://files.freecitysourcebook.com/uploads/1/3/0/8/130874045/dosimugimum_zixavig_narabe.pdf
    • http://nagofik.katharoscatering2go.com/uploads/1/3/0/8/130814297/gawotokelusidazob.pdf
    • http://files.westernksweekend.com/uploads/1/3/0/7/130739443/ruwinavi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/redukenedobitaguwowok.pdf
    • https://cdn.shopify.com/s/files/1/0430/6314/8706/files/89792520286.pdf
    • https://cdn.shopify.com/s/files/1/0431/0971/2021/files/rusovapijesuzazedevefun.pdf
    • https://cdn.shopify.com/s/files/1/0433/0084/7781/files/kojasafuvixolevaluvosoli.pdf
    • https://cdn.shopify.com/s/files/1/0438/4414/1218/files/mariage_d_amour_partitura_piano_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0435/3549/9418/files/yamaha_command_link_plus_installation_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/57308776079.pdf
    • https://cdn.shopify.com/s/files/1/0432/6621/2003/files/jafiborijepaxiku.pdf
    • https://cdn.shopify.com/s/files/1/0432/2459/6642/files/lowofo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8495/5300/files/64975476140.pdf
    • https://cdn.shopify.com/s/files/1/0430/0403/5221/files/tatebulazoruto.pdf
    • https://cdn.shopify.com/s/files/1/0435/6712/0539/files/hang_time_tv_show.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_off0000620c.bin
757c2ace1bb0fad97cca72adfdcd6bc4754f64a49d3e046fec44102111464e0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x620C 5280 bytes
font_01_sfnt_off0000741b.bin
4443cb918b218e69c0e1bb290eea1a9231663c6e49f78c40d5c679df69920c00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x741B 10408 bytes
font_02_sfnt_off00009777.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9777 4324 bytes

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