Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4d78043685087c…

MALICIOUS

PDF

46.1 KB Created: 2020-08-11 18:41:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12f89f4f53eca2c778c1c16fad1aa617 SHA-1: 08351f6cbd740e881e5ae0c3c18881d1345b386f SHA-256: ab4d78043685087c0b8b88dbc5e8ed8d4085cacc24a863232f4394f4b7f87020
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains embedded URLs, one of which, https://ttraff.ru/wb?keyword=software%20testing%20lab%20manual, is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect the user to malicious infrastructure. The presence of numerous other Shopify links, while benign, likely serves to obscure the malicious redirector within a larger link farm.

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/wb?keyword=software%20testing%20lab%20manual
    • http://files.alsrace.nl/uploads/1/3/1/4/131408970/e0b997.pdf
    • http://jopimowe.babasvegancafe.com/uploads/1/3/0/8/130814328/fokisivet.pdf
    • http://files.ntexcelerate.com/uploads/1/3/0/8/130874180/povajurakipisapawobo.pdf
    • https://cdn.shopify.com/s/files/1/0440/8036/5720/files/dojebisuraf.pdf
    • https://cdn.shopify.com/s/files/1/0428/8764/3302/files/wovubime.pdf
    • https://cdn.shopify.com/s/files/1/0435/5604/4951/files/cambridge_igcse_mathematics_core_and_extended_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0431/6083/0103/files/gakokasagedar.pdf
    • https://cdn.shopify.com/s/files/1/0428/5943/0047/files/buxelikozowurowigewamono.pdf
    • https://cdn.shopify.com/s/files/1/0427/7148/0742/files/longest_increasing_path_in_a_matrix.pdf
    • https://cdn.shopify.com/s/files/1/0433/6248/4383/files/characteristics_of_modernism_in_american_literature.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29942388251.pdf
    • https://cdn.shopify.com/s/files/1/0433/2643/9582/files/l_empirisme_et_le_rationalisme.pdf
    • https://cdn.shopify.com/s/files/1/0430/6167/4133/files/wovex.pdf
    • https://cdn.shopify.com/s/files/1/0432/0195/3952/files/95597664403.pdf
    • https://cdn.shopify.com/s/files/1/0434/8634/7414/files/rorschach_test_online.pdf
    • https://cdn.shopify.com/s/files/1/0429/8126/1466/files/babafideti.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_off000074a1.bin
825ce39a1147648eef66a0f3cc96de1f103d72a59ad38b8b803aa18987344012		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74A1 5420 bytes
font_01_sfnt_off00008706.bin
9d454cb6148a82b0f777d69b2ba300a65695f0b75ed4edb37146e55bf5b2426c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8706 10792 bytes

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