Malicious PDF — malware analysis report

Static analysis result for SHA-256 820a5d1a1b5e17e7…

MALICIOUS

PDF

47.0 KB Created: 2020-08-24 17:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b74675fc2c349471626df7f6f70988c6 SHA-1: e9e3636205049be6696e711167c5fe8267d64915 SHA-256: 820a5d1a1b5e17e7084e1f07096f2d68c4c94220c58b04fce24f67debea7e55c
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple links to a redirector service, which in turn points to a link farm of other PDFs. The primary malicious URL identified is https://ttraff.ru/pify?keyword=game+by+utorrent+or+bittorrent. The document body, though heavily obfuscated, also contains this URL, suggesting it's the intended destination. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pify?keyword=game+by+utorrent+or+bittorrent In PDF document text
    • http://files.lanagates.com/uploads/1/3/0/7/130775537/wijipodi_towebexujaj.pdfIn PDF document text
    • http://files.davidsonhc.com/uploads/1/3/0/7/130776327/fepisasat.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/1/0437/4780/3287/files/nomivamikeledikexuruta.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3729/4754/files/ffxiv_blood_pepper.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9881/6150/files/50758747255.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1512/5662/files/definisi_alkalinitas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2730/7416/files/lp_meningoencephalitis_tb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8789/6480/files/alita_battle_angel_movie_counter.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0300/9434/files/wosuregosovikuf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1968/1437/files/84680191256.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9272/9246/files/nitixixidozeposijovafarat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9857/9879/files/tuxemopupumukogenu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5181/7883/files/59752192910.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/36920421444.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0749/2775/files/advanced_trumpet_solos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5542/4423/files/belajar_excel_pemula.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_off00007b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B24 4892 bytes
SHA-256: e2ea32f50fca1fe9c96a9e1b69de26888b281520f6480275432ce2e17adb3f7e
font_01_sfnt_off00008bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BBD 10268 bytes
SHA-256: 02209e12992bce0d9ba9f51fe7fa35884f2d404dcadf75650f0cb637ca609c9d