Malicious PDF — malware analysis report

Static analysis result for SHA-256 b75c0c31a9b609d2…

MALICIOUS

PDF

39.5 KB Created: 2020-07-08 16:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-25
MD5: c17f1b8e3c9f66b98e5d460c0340f89d SHA-1: 735ebb2f89f0d5f3e7cfe8cd5906a3376210f90b SHA-256: b75c0c31a9b609d209ee2c7e4d054fbc8f02069e52e186d9a9d1213d6aa506df
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded URLs, identified as a link farm. One URL, 'https://ttraff.cc/pify?keyword=immunology+serology+turgeon+pdf', points to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The presence of numerous links suggests an attempt to lure users to potentially malicious sites.

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://ttraff.cc/pify?keyword=immunology+serology+turgeon+pdf In PDF document text
    • http://files.communitybiblechurchdemotte.com/uploads/1/3/1/3/131378779/bazabobutizodikaxub.pdfIn PDF document text
    • http://files.messybunsandlittleones.com/uploads/1/3/0/7/130776481/297670.pdfIn PDF document text
    • http://files.hickmanfootball.com/uploads/1/3/0/7/130776788/kamubumul-dobozokowobiz.pdfIn PDF document text
    • http://files.innerdolphinawakening.com/uploads/1/3/1/6/131606035/kumuvefajolen.pdfIn PDF document text
    • http://files.dremilyleonard.com/uploads/1/3/1/6/131637919/pusiberujebu.pdfIn PDF document text
    • http://files.satinkissed.net/uploads/1/3/0/8/130873895/vutagib.pdfIn PDF document text
    • http://files.wrestlingjerusalem.com/uploads/1/3/0/7/130740180/rumowiwi.pdfIn PDF document text
    • http://files.gretchendriscoll.com/uploads/1/3/1/1/131164351/cd455178.pdfIn PDF document text
    • http://files.ashleyparsonsyoga.com/uploads/1/3/2/7/132740415/newixebomufobezofawe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://kamefuvon537357468.files.wordpress.com/2020/07/30560775927.pdfIn PDF document text
    • https://busamonavek.files.wordpress.com/2020/07/77438015008.pdfIn PDF document text
    • https://xopaluwefaje.files.wordpress.com/2020/07/59147848704.pdfIn PDF document text
    • https://nikiruweti.files.wordpress.com/2020/06/96614718557.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/38746106010.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/30553092986.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23063093424.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/giratajolexodomofavewolov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/3785448733.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86562581376.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nasodidupafulad.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_off00005dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DDE 5024 bytes
SHA-256: 6107e96e4fed1362bebfd7796281d63822be7e03cf1d600b9dc0f5c4bc89d157
font_01_sfnt_off00006ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EE4 10088 bytes
SHA-256: 412e2a94dd16694f4acd537f1720080aa9fc766780ddff7b74e350195635d352