Malicious PDF — malware analysis report

Static analysis result for SHA-256 e37e5b4895b7763c…

MALICIOUS

PDF

77.7 KB Created: 2020-08-15 01:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13f16036e81cfd33d7a3d5194271a621 SHA-1: b77f9582250a2de3dd2f1e00659d3628e8350e90 SHA-256: e37e5b4895b7763c249cb1f3e0e1530bd307bc9a93c316a19224cd161f7d0021
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL. The presence of a large number of embedded external links, many hosted on shopify.com, suggests a link farm or SEO poisoning tactic to disguise the malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

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=frontiers+in+immunology+guide+for+authors
    • http://files.emeraldis.org/uploads/1/3/0/7/130776423/5035716.pdf
    • http://files.greenbrierconcours.com/uploads/1/3/0/8/130874646/1762448.pdf
    • http://files.gianfuffo.org/uploads/1/3/1/6/131636954/6294539.pdf
    • http://files.emeraldis.org/uploads/1/3/0/7/130776423/5035716.pd
    • https://cdn.shopify.com/s/files/1/0431/9887/3762/files/45905444761.pdf
    • https://cdn.shopify.com/s/files/1/0434/1543/7468/files/mizutozeder.pdf
    • https://cdn.shopify.com/s/files/1/0435/5316/1367/files/mathematics_teacher_cv.pdf
    • https://cdn.shopify.com/s/files/1/0444/8750/8135/files/azure_information_protection_adobe.pdf
    • https://cdn.shopify.com/s/files/1/0436/4068/4697/files/23532363037.pdf
    • https://cdn.shopify.com/s/files/1/0434/4774/6721/files/65104853531.pdf
    • https://cdn.shopify.com/s/files/1/0433/1434/8197/files/97670025685.pdf
    • https://cdn.shopify.com/s/files/1/0429/0327/3628/files/tactics_for_listening_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pesaveput.pdf
    • https://cdn.shopify.com/s/files/1/0437/3191/0810/files/edema_pulmonar_perros.pdf
    • https://cdn.shopify.com/s/files/1/0437/0812/1242/files/66004721883.pdf
    • https://cdn.shopify.com/s/files/1/0430/4276/7001/files/dovudemobogabasizotoperik.pdf
    • https://cdn.shopify.com/s/files/1/0429/6887/5157/files/57540217904.pdf
    • https://cdn.shopify.com/s/files/1/0434/2448/1431/files/calidad_del_aire_en_mexico.pdf
    • https://cdn.shopify.com/s/files/1/0430/6845/7122/files/23496518011.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a73d.bin
1e139a55f54eb507cbb7492077ef5aff90bba7fb380ceee2cef3fe7f9ebd27be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA73D 19492 bytes
font_01_sfnt_off0000e43b.bin
6f908859ac5ba2acdbf7c90fe9119829a10df91e420f1f562a55247462c4a62f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE43B 5260 bytes
font_02_sfnt_off0000f5ef.bin
ab51e08200455ca8ef6435465abad5623a3ac64edb9fe909b6bf687ff1ce1ddc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EF 10696 bytes
font_03_sfnt_off00011a7a.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7A 4324 bytes

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