Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb07d2458d23b1f8…

MALICIOUS

PDF

39.0 KB Created: 2020-08-20 02:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f33a6b3392adbd743b5cb8960bd987c3 SHA-1: 0769c18dde75ef7ad8298d91b6b77e01dec93755 SHA-256: cb07d2458d23b1f827de5c5b265a665508fddea2df913ff8e9a91c21a3450429
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to external resources, suggesting a link farm or redirection attempt. One critical heuristic firing indicates a direct link to known malicious redirector infrastructure. The document body, though partially corrupted, contains the text 'Annual tax payment report' and the malicious URL, reinforcing the lure. The presence of numerous PDF links, including the malicious one, suggests the primary goal is to redirect the user to potentially harmful 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.ru/pify?keyword=annual+tax+payment+report
    • http://files.juheonlee.com/uploads/1/3/2/6/132695384/zalegetubedogu.pdf
    • http://files.overthemoonbrts.com/uploads/1/3/2/3/132302907/369426.pdf
    • http://files.outsidetheboxkwc.com/uploads/1/3/2/6/132682647/9407273.pdf
    • http://remoge.lprincedesignsartjewelry.com/uploads/1/3/1/4/131406436/vufenubojul.pdf
    • http://galeza.powerofmath.net/uploads/1/3/1/3/131379478/2050617.pdf
    • https://cdn.shopify.com/s/files/1/0427/8845/4559/files/chuy_s_nutritional_information_refried_beans.pdf
    • https://cdn.shopify.com/s/files/1/0430/6799/8362/files/sipizusav.pdf
    • https://cdn.shopify.com/s/files/1/0427/9818/6663/files/pradhan_mantri_awas_yojana_in_gujarati.pdf
    • https://cdn.shopify.com/s/files/1/0437/2630/7480/files/reduce_file_size_below_2_mb_online.pdf
    • https://cdn.shopify.com/s/files/1/0435/6741/5457/files/shl_verbal_test_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/9048/5150/files/bijeretofakalixameku.pdf
    • https://cdn.shopify.com/s/files/1/0435/1482/2811/files/30787674177.pdf
    • https://cdn.shopify.com/s/files/1/0428/9154/2681/files/24407816631.pdf
    • https://cdn.shopify.com/s/files/1/0435/3441/8072/files/zupisivudoxemulo.pdf
    • https://cdn.shopify.com/s/files/1/0428/2938/1791/files/wow_patch_7._1._5_notes.pdf
    • https://cdn.shopify.com/s/files/1/0437/6769/3474/files/vafatoranosilaxufovelunu.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059ca.bin
533c8811ef7f01ef08c05350b7eb7a8acd8706cfb16c9732097981712191d332		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59CA 4944 bytes
font_01_sfnt_off00006a85.bin
27fc5bd99a919010806d1f4c33489bf1992c0633a5347833fe925fc9ae1719cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A85 10644 bytes

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