Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f56142b62035fe9…

MALICIOUS

PDF

39.8 KB Created: 2020-11-05 21:25:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0293f078c43fc1673d5ae1ae52ef8d90 SHA-1: 9c4a9957ae8909fb4d2cad4bd60704fd4650484b SHA-256: 1f56142b62035fe93ef134a7103051d80cd6b978614121cf1550b2a9afa922de
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ggtraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, including one hosted on AWS. The ML classifier also strongly indicated maliciousness. These factors suggest the document is designed to lure users to malicious sites, likely as part of a phishing or spam campaign.

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://ggtraff.ru/123?keyword=lighting+planning+condition
    • https://pavowojavujide.weebly.com/uploads/1/3/1/3/131398322/44ed2334b6121.pdf
    • https://sawonelezaxiso.weebly.com/uploads/1/3/4/5/134588179/4380976.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/leguvefu/87122685064.pdf
    • https://s3.amazonaws.com/jowutoneranemuk/kiziwobivedonuzar.pdf
    • https://s3.amazonaws.com/lanorolowu/manual_de_auditoria_de_sistemas_informaticos.pdf
    • https://uploads.strikinglycdn.com/files/d047852f-9d3a-4ab3-a6e7-f13f18f4a611/diagnsticos_nanda_2017.pdf
    • https://s3.amazonaws.com/tumasun/the_algorithm_design_manual_github.pdf
    • https://s3.amazonaws.com/ditiruz/mawama.pdf
    • https://uploads.strikinglycdn.com/files/014bb562-a81d-4392-ab18-e6edfd921332/14468880198.pdf
    • https://uploads.strikinglycdn.com/files/7cc312a7-2270-4a7d-b814-08e4a1fce00f/siempre_est_viniendo_pero_nunca_lle.pdf
    • https://uploads.strikinglycdn.com/files/5ce32d4f-61ab-4a69-92ea-ac2d0d325654/23105520996.pdf
    • https://s3.amazonaws.com/numegubowalonan/butomawagapus.pdf
    • https://cdn.shopify.com/s/files/1/0497/8137/5125/files/ac_delco_spark_plug_gap_guide.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e95.bin
0182d341e6faaff7a5246472b56c4df4d92d68f248e49aba3548182c17cc23dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E95 5000 bytes
font_01_sfnt_off00006f9c.bin
bdb0a63061f4d8da23eae46c7a57ef7af22e2504e2101ab2b7b5493a658d8459
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F9C 9772 bytes