Malicious PDF — malware analysis report

Static analysis result for SHA-256 d36f925887dc3c1b…

MALICIOUS

PDF

39.8 KB Created: 2020-08-27 13:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3055bbddf4991d8bbfa8e649e202ef2f SHA-1: d33c0363c9a02f2893ef5e1f682fbba0a23ff30c SHA-256: d36f925887dc3c1bc68ed2863d7361be442126b8a96fb1041598e2aaf2eaee56
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged as malicious due to a critical heuristic identifying it as a redirector link to known malicious infrastructure. Additionally, it contains a large number of external PDF links, many hosted on Shopify, suggesting a link farm intended for SEO manipulation or malicious redirection. The embedded URL points to 'ttraff.ru', a known malicious redirector. While no scripts were extracted, the PDF structure and embedded links strongly indicate a malicious intent to lure users to harmful sites.

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=tomorrow+will+be+better+book
    • http://reruwitop.walkerorchestra.com/uploads/1/3/1/8/131871449/gisadafovuwutewimaba.pdf
    • http://files.tinakimani.com/uploads/1/3/1/4/131407406/3cf309f49c7.pdf
    • https://cdn.shopify.com/s/files/1/0437/3744/8609/files/amaravati_master_plan.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/resozelofik.pdf
    • https://cdn.shopify.com/s/files/1/0435/8258/7039/files/surah_ar_rahman_latin_dan_arab.pdf
    • https://cdn.shopify.com/s/files/1/0427/9920/2467/files/79305243628.pdf
    • https://cdn.shopify.com/s/files/1/0434/0298/5621/files/60143820461.pdf
    • https://cdn.shopify.com/s/files/1/0431/5627/5362/files/88326439436.pdf
    • https://cdn.shopify.com/s/files/1/0428/7882/8700/files/santa_baby_madonna.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/93616534700.pdf
    • https://cdn.shopify.com/s/files/1/0434/3873/5512/files/41289064732.pdf
    • https://cdn.shopify.com/s/files/1/0429/8987/9445/files/backup_android_bookmarks_to_sd_card.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/munununexarusod.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_off00006011.bin
135cb0a1c020c9af6d68434ebf333cb4d689fd2902c5d050e186d504e09aa612
pdf-font-stream PDF embedded font (sfnt) at offset 0x6011 4688 bytes
font_01_sfnt_off00007002.bin
19b3f955f6ca819cd8ac0da8fc9d8b0c5fe9680c68a59464a4cc89df7f6e59cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x7002 10136 bytes