Malicious PDF — malware analysis report

Static analysis result for SHA-256 3783908ded44490c…

MALICIOUS

PDF

34.0 KB Created: 2020-11-04 21:45:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 8f35e71f5d3c4589a341cdb3ebbfd004 SHA-1: d6a37b8eef0a71b0780b23df3371ead33734b8e2 SHA-256: 3783908ded44490cf18f8377d199135d46e5b2e95e8a60209c8100e9aa5d841b
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to `https://ttraff.ru/123?keyword=tri-county+family+medicine+geneseo+ny`. This URL is likely used to redirect the user to a malicious site. The document also contains a large number of external links, many of which point to benign PDFs, suggesting a link farm or SEO poisoning attempt to improve the ranking of the malicious redirector. No scripts were extracted, but the presence of embedded URLs and the malicious redirector strongly indicate a phishing or redirection attack.

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/123?keyword=tri-county+family+medicine+geneseo+ny In PDF document text
    • https://jowesezowu.weebly.com/uploads/1/3/4/3/134366841/losivobomepefosobu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401696/normal_5f9574ce68136.pdfIn PDF document text
    • https://seboneluwisog.weebly.com/uploads/1/3/4/3/134368334/tumilejak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422180/normal_5f9afebb4402f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414682/normal_5fa06b76ed387.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368970/normal_5f8a72eb20a82.pdfIn PDF document text
    • https://xumabilere.weebly.com/uploads/1/3/1/1/131163638/8603801.pdfIn PDF document text
    • https://xemivigezeb.weebly.com/uploads/1/3/4/4/134481563/01f2901b.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/wisuw/brushless_alternator.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/present_simple_and_present_continuous_exercises_intermediate_level.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/hacked_pokemon_surprise_trade.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/soldier_lyrics_rachel_platten.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/peter_f_drucker_managing_oneself.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/uv_visible_spectroscopy_working_principle.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/55336141770.pdfIn PDF document text
    • https://s3.amazonaws.com/zokokamu/93450690699.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_off000046ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x46EA 5424 bytes
SHA-256: a3825893f9c3b03290c9700b94629d446694fc7710c355980b30f0d617c8cd4b
font_01_sfnt_off0000595b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x595B 9916 bytes
SHA-256: 794efa40493b787507df40f2044aa19a7bb7e706b9fd0e68484dddeab34b952f

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