Malicious PDF — malware analysis report

Static analysis result for SHA-256 fddda5a8b6b268b6…

MALICIOUS

PDF

36.2 KB Created: 2020-09-24 10:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0e5d3551c0ef75110c7fef988e4b7e01 SHA-1: 3cf2663bd4933829d2206db03306fdd453db7966 SHA-256: fddda5a8b6b268b6c0d99c55a93b8781d408577af60e7d761d4933a288859c9a
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the text "Gcp nih training quiz answers" and a URL that matches the redirector. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, suggesting a link farm or spamming operation. While no scripts were explicitly extracted, the nature of the redirector and the link farm points towards a phishing or malicious content distribution 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 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.club/pify?keyword=gcp+nih+training+quiz+answers In PDF document text
    • http://vazidomax.sasolmc.org/uploads/1/3/2/6/132682156/guvonomezexaze.pdfIn PDF document text
    • http://nimolo.barefoottofino.com/uploads/1/3/2/7/132741009/8569925.pdfIn PDF document text
    • http://files.anstrutherlifeboat.org/uploads/1/3/1/3/131381658/goxukokor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4216/7189/files/4958841316.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5198/3783/files/60716420111.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1316/8542/files/51765584332.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8985/7174/files/laxotefafafexur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2458/7674/files/58914573438.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/7084/7131/files/rulip.pdfIn PDF document text
    • https://a1cc6613-c221-4214-9400-929f79dd8125.filesusr.com/ugd/5dc3ca_c7ef757a5398414fb046c0e4bb066237.pdf?index=trueIn PDF document text
    • https://f43830db-6ba5-4ef4-939c-6ddbeecbac14.filesusr.com/ugd/17159d_47571ee7ce6f410b80f9e529761c5163.pdf?index=trueIn 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_off00004e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E9D 5464 bytes
SHA-256: ee5a8a19c094407f78f0e97e90ef9290fc5c6627098beb1341c959349a219ab0
font_01_sfnt_off00006149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6149 10240 bytes
SHA-256: 84c2ab7cae21197e4c78bac85b22f5c1eea18ebd76d9ac9b62cc5bff7dbcd0ee

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