Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ac5ab1d750df31…

MALICIOUS

PDF

34.3 KB Created: 2020-11-03 10:57:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 28ad371010bee24f211a05033c0da0c6 SHA-1: e649936ddfe7cc0a66ea7fecdfaae84be3104a4d SHA-256: 51ac5ab1d750df3152a176c42d90d9ccf7e15c314c581de880de721c404de69b
194 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector leading to `https://gettraff.ru/aws?keyword=df+fuse+holder`. The document also functions as a link farm, directing users to various PDF files hosted on external services, suggesting a phishing or malware distribution attempt. The ML classifier strongly indicated maliciousness, supporting the assessment of a malicious redirector and link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://gettraff.ru/aws?keyword=df+fuse+holder In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372955/normal_5f99a2e2d6d61.pdfIn PDF document text
    • https://goresizusozal.weebly.com/uploads/1/3/4/5/134524816/2762f7108f2b.pdfIn PDF document text
    • https://roxejane.weebly.com/uploads/1/3/4/4/134486752/nulubunupogu-romogujetowugoz-kosuwofisam-vebuwavefa.pdfIn PDF document text
    • https://nigupisotaku.weebly.com/uploads/1/3/4/3/134374455/tipulugijosizud_gugamog.pdfIn PDF document text
    • https://gafalevomunu.weebly.com/uploads/1/3/4/2/134235362/47b437f7c549f5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/911c68a6-2368-48d4-a85a-210f0c5e7797/akuma_no_riddle_op_download.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/bloxburg_script_gui.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/53157710592.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d05de8fb-cd20-4bec-a1ea-108f239962b8/pevifunolanoziligerag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69cc6e36-82ac-4c20-8638-130a70eb7036/lozowutupen.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/busetevo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/799ff310-45bd-462f-9260-cee1412298ee/36005308797.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_off00004a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A0B 4784 bytes
SHA-256: da0e32308267596b72617ab86d184add52db15435ec1cdb91974235160d1d342
font_01_sfnt_off00005a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A50 10048 bytes
SHA-256: ec02936b2c9964f7b02c98a88d2b01dc41f9892d2e59ac3ed9370fe406122e5b