Malicious PDF — malware analysis report

Static analysis result for SHA-256 04bd9ed3a495fd28…

MALICIOUS

PDF

44.3 KB Created: 2020-08-09 10:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf42dfd9caa384a7d1ce2909d54ae551 SHA-1: 8bb2a2c0aed060422529656aa5360aa1c3414b3d SHA-256: 04bd9ed3a495fd28d7fe2885292aebf81fbab3fe1d4d6e1ba387c2d506060c30
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector service, which is a common tactic for phishing and malware distribution. The document body itself is heavily obfuscated but contains the same malicious URL, suggesting an attempt to lure the user to a malicious site. The presence of numerous links to external PDF files, many hosted on Shopify, indicates a link farm or SEO poisoning attempt to improve search engine ranking for malicious content.

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.cc/pify?keyword=schumann+arabeske+op+18+pdf
    • http://mumagis.peterjstewarteditor.com/uploads/1/3/0/7/130775162/2251629.pdf
    • http://files.threeaineconsultancy.com/uploads/1/3/1/0/131070125/587526f65.pdf
    • http://files.zbmtwest.com/uploads/1/3/0/7/130775076/nopire.pdf
    • http://files.iowacollegemediaassociation.com/uploads/1/3/1/4/131411857/6726355.pdf
    • http://files.parkroadbaptistcdc.org/uploads/1/3/0/7/130776255/1bb0712093.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/5467/8687/files/1520040095.pdf
    • https://cdn.shopify.com/s/files/1/0437/1061/1605/files/637144644.pdf
    • https://cdn.shopify.com/s/files/1/0437/1313/4743/files/57362312272.pdf
    • https://cdn.shopify.com/s/files/1/0451/0393/9737/files/88738199397.pdf
    • https://cdn.shopify.com/s/files/1/0431/0600/9255/files/gikofakovefigobetitazugip.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rasamonuje.pdf
    • https://cdn.shopify.com/s/files/1/0434/8982/0836/files/waboginavedokif.pdf
    • https://cdn.shopify.com/s/files/1/0435/1960/6936/files/74831741970.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1650/files/27465875639.pdf
    • https://cdn.shopify.com/s/files/1/0429/3738/5123/files/dazevejamarewojafow.pdf
    • https://cdn.shopify.com/s/files/1/0432/1165/3277/files/vuzokujipujowabubozus.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000554f.bin
5e4d4112b6955e3fe083f2587015ed95be2b6d7026ce62cfae4ada3da6850c00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x554F 5916 bytes
font_01_sfnt_off00006947.bin
e59777256407c9cb25fff9af5accc7a0b4837dad448e07d7fc56ab986d0d1794		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6947 11308 bytes
font_02_sfnt_off00008eb1.bin
73e2bae015806fcbcea00a5e77fef36cf57312733aebee32ba98308b5ce41d75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EB1 16120 bytes

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