Malicious PDF — malware analysis report

Static analysis result for SHA-256 50ba2b7727824318…

MALICIOUS

PDF

46.7 KB Created: 2020-08-17 18:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f31d1ef1e9806c749f9829cfac301f1d SHA-1: e81a0c4be5462a36dd3050a3f94f8fb6ef06084b SHA-256: 50ba2b7727824318bba7e22f85820e18a19fec13fd259d7ff72ae0f0e3929fb5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded links, including one pointing to a known malicious redirector infrastructure at 'ttraff.ru'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to distribute malicious content or engage in SEO manipulation. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of numerous links and the malicious redirector strongly indicate a phishing or content distribution attack pattern.

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/pify?keyword=nice+guidelines+primary+prevention+statin
    • http://files.jenrosadupuis.com/uploads/1/3/0/7/130738889/juxofadonegidajabi.pdf
    • http://junevinef.topazcentre.org/uploads/1/3/1/4/131406665/383d8ae96021f0.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/zewirusujadubadekaxobagex.pdf
    • https://cdn.shopify.com/s/files/1/0434/6871/8233/files/78134648280.pdf
    • https://cdn.shopify.com/s/files/1/0435/8340/6243/files/60424644291.pdf
    • https://cdn.shopify.com/s/files/1/0434/0737/6542/files/south_park_asspen.pdf
    • https://cdn.shopify.com/s/files/1/0432/0608/2717/files/rezawudalorefedo.pdf
    • https://cdn.shopify.com/s/files/1/0437/2830/6330/files/kolawuxusezu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7863/1072/files/gonadavomidana.pdf
    • https://cdn.shopify.com/s/files/1/0434/1871/4264/files/bahubali_tamil_movie_audio_songs.pdf
    • https://cdn.shopify.com/s/files/1/0437/1814/8261/files/zozisuso.pdf
    • https://cdn.shopify.com/s/files/1/0437/3348/3674/files/couverture_maladie_universelle_en_cte_d_ivoire.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007841.bin
6a5d203ab75612a87123df4a82dbadc14d48c44a3e0c75378469a4d8b832e827
pdf-font-stream PDF embedded font (sfnt) at offset 0x7841 5524 bytes
font_01_sfnt_off00008afc.bin
edf07f86de59e96c0539afc1ecd0adc16e082cf039f2c87907948d235e83d965
pdf-font-stream PDF embedded font (sfnt) at offset 0x8AFC 10140 bytes