Malicious PDF — malware analysis report

Static analysis result for SHA-256 70a44efabbe11840…

MALICIOUS

PDF

55.8 KB Created: 2020-08-17 02:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f1c505ff3eab4fdccedd37160bc8f41 SHA-1: b7ab57e190a62e18de431a6b3aa77e6c454cba1e SHA-256: 70a44efabbe1184095d11e83966b2a8feeed54e4f4f72faea684e9d8a9928718
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, forming a link farm. One of the primary links, 'https://ttraff.ru/pify?keyword=android+version+huawei+mate+9', is flagged as a malicious redirector. This suggests the document is designed to drive traffic to malicious infrastructure, likely for further exploitation or phishing.

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=android+version+huawei+mate+9
    • http://walopame.southernstyledevents.com/uploads/1/3/2/7/132740405/d1a050f7f3b4.pdf
    • http://files.badgirls.hu/uploads/1/3/1/4/131482954/jased.pdf
    • http://files.ruthcadioli.com/uploads/1/3/0/7/130776674/821578.pdf
    • http://files.27andoak.com/uploads/1/3/1/1/131163914/7027796.pdf
    • http://files.kirstenbuttononline.com/uploads/1/3/1/0/131070178/ligagivebo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/26965864763.pdf
    • https://cdn.shopify.com/s/files/1/0431/1416/8480/files/57359361735.pdf
    • https://cdn.shopify.com/s/files/1/0431/5050/8181/files/sour_grapes_story.pdf
    • https://cdn.shopify.com/s/files/1/0441/2047/3752/files/60213242208.pdf
    • https://cdn.shopify.com/s/files/1/0431/8907/6117/files/vepoduvujofag.pdf
    • https://cdn.shopify.com/s/files/1/0434/8697/0021/files/zifovujumoseki.pdf
    • https://cdn.shopify.com/s/files/1/0428/2541/6860/files/low_back_pain_home_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0433/8325/9301/files/gigewifibulepa.pdf
    • https://cdn.shopify.com/s/files/1/0429/2519/5427/files/calvinismo_e_arminianismo_livro.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007cf0.bin
d4d9f0be1b1fae846476ffaf3b38cc87650e3847171b3c3df75d80685eb137c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CF0 9572 bytes
font_01_sfnt_off00009cef.bin
546449e8f8a1d22bd313eb4cd39ccfa81b17182f4e98a0df114f55efb01d2138
pdf-font-stream PDF embedded font (sfnt) at offset 0x9CEF 5328 bytes
font_02_sfnt_off0000aef3.bin
3274f8d0679abb6b86fc63a1cc9ee139040d64b5d1b188e3a5f160972d64dc65
pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF3 10220 bytes