Malicious PDF — malware analysis report

Static analysis result for SHA-256 5db617f1ad1e219b…

MALICIOUS

PDF

50.4 KB Created: 2020-08-08 11:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1212fbfa2622d7c627cd84db7a87adf SHA-1: 37b112685e9b367021afbe88610d8a3b77a68760 SHA-256: 5db617f1ad1e219bffa8643120248c7b8e27c2d43b1b42bef77fd5726f7398d4
162 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised as a document download. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the redirector URL and numerous other URLs, suggesting a link farm or redirection attempt. No scripts were extracted, but the presence of malicious links and the ML detection point to 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=algorithms+and+data+structures+pdf
    • http://vududobar.fillmaninsurance.com/uploads/1/3/1/4/131437402/lamufokodixe_mawizusod_sebuk.pdf
    • http://files.fitworks1.com/uploads/1/3/0/8/130874543/siturikatonunevov.pdf
    • http://files.skyviewwa.com/uploads/1/3/0/8/130873717/tefuvemodixol-nebidimeno-kafujur.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/9853/0202/files/cardiomiopatia_restrictiva.pdf
    • https://cdn.shopify.com/s/files/1/0433/9266/3702/files/vigifaxonamuvuw.pdf
    • https://cdn.shopify.com/s/files/1/0434/7258/4861/files/naxedibe.pdf
    • https://cdn.shopify.com/s/files/1/0437/8014/5313/files/16871584391.pdf
    • https://cdn.shopify.com/s/files/1/0432/1509/3920/files/76103444255.pdf
    • https://cdn.shopify.com/s/files/1/0430/7727/1706/files/fadevapizuredawigibawin.pdf
    • https://cdn.shopify.com/s/files/1/0436/2688/9369/files/46192747278.pdf
    • https://cdn.shopify.com/s/files/1/0436/1748/4957/files/adn_polymerase.pdf
    • https://cdn.shopify.com/s/files/1/0438/2516/8544/files/pipojo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2494/9153/files/jakavulefovajaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/5523/4710/files/15076287233.pdf
    • https://cdn.shopify.com/s/files/1/0433/5150/7112/files/89307359908.pdf
    • https://cdn.shopify.com/s/files/1/0434/3080/5671/files/41326169218.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_off000078c1.bin
b1f1532cbe55f5472db3f29db9c086c680bd61d4f6312822deca94b0d9c4d3d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78C1 5440 bytes
font_01_sfnt_off00008b12.bin
201362107f5aff7771865f0e34ee6693b7959cf73208c0c8d7282b819932a241		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B12 10348 bytes
font_02_sfnt_off0000ae9e.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE9E 4324 bytes

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