Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4598f8599c592bd…

MALICIOUS

PDF

38.1 KB Created: 2020-11-02 04:46:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 55e5611ece81e1f882b8b0ad29aa7e68 SHA-1: a26ade7d85b2b2b43291d7d6687654d44c9004e9 SHA-256: a4598f8599c592bdb91c219292a593fd44ccd162689e0b908289db87408da592
124 Risk Score

Malware Insights

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

The PDF contains embedded URLs, one of which, https://ggtraff.ru/aws?keyword=earth+science+june+2019+regents+answers, is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and other links, suggesting a lure to external malicious content. The ML classifier strongly indicates maliciousness, supporting the attack pattern of a phishing or redirection attempt.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/aws?keyword=earth+science+june+2019+regents+answers In PDF document text
    • https://larogarokod.weebly.com/uploads/1/3/4/0/134018293/5dd2cb37.pdfIn PDF document text
    • https://poxanopa.weebly.com/uploads/1/3/4/3/134380657/rabekibuferukul.pdfIn PDF document text
    • https://defejeve.weebly.com/uploads/1/3/4/3/134386135/4287044.pdfIn PDF document text
    • https://nizesuvijeva.weebly.com/uploads/1/3/1/6/131607023/d3870f44.pdfIn PDF document text
    • https://juvikenozenukun.weebly.com/uploads/1/3/4/3/134322787/goludepe-sizitosuruw-vazopemutepor.pdfIn PDF document text
    • https://zegojipoxe.weebly.com/uploads/1/3/1/0/131069766/bb2cac.pdfIn PDF document text
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/piwituromakogu-fobigujudosewad-dexap-xofebutexerilul.pdfIn PDF document text
    • https://jedunifoxawixe.weebly.com/uploads/1/3/4/4/134458330/sozikiju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gupuso/47473223805.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/8667774671.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8675/0916/files/43377182035.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/vuvukifelujazamit.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/all_tailed_beast_strongest_to_weakest.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/3503589095.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000055a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x55A6 5636 bytes
SHA-256: c7d92bc7477b41c6a7c1c35bae40de33984c517ef3d99fc0b66b733af7341f5c
font_01_sfnt_off000068eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68EB 10240 bytes
SHA-256: e241ce84c8b965b676f3292ffc2c089307edac443cd81beb12b30fa84e9089a4

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