Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e789e6d482d88e…

MALICIOUS

PDF

43.9 KB Created: 2020-08-15 03:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ab9eee4ef639a95ea54ca59a983bf91 SHA-1: 3d13ac2c13a5f2854f2a37524be918b134161892 SHA-256: d5e789e6d482d88e39b0d6cb8d6d6d91b0f8816fe048e4a26ac189c5111d2afc
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a prominent link that redirects to a malicious URL, masquerading as an antivirus download. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this behavior. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, many hosted on cdn.shopify.com, suggesting a link farm used for SEO poisoning or distributing malicious content. The ML classifier also strongly indicated maliciousness.

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.cc/pify?keyword=android+antivirus+apk+pro
    • http://files.justplayscript.com.au/uploads/1/3/0/8/130814714/884951.pdf
    • http://files.heatherdexter.com/uploads/1/3/1/3/131381480/bozegonapinovaminume.pdf
    • http://pagapunan.beckeras.no/uploads/1/3/0/8/130813765/8131886.pdf
    • http://files.lpdcllc.com/uploads/1/3/0/7/130740318/4201149.pdf
    • https://cdn.shopify.com/s/files/1/0429/2273/7830/files/legiz.pdf
    • https://cdn.shopify.com/s/files/1/0437/1444/5465/files/tame_impala_elephant_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0431/8475/0743/files/neurofibromatosis_tipo_1_pediatria.pdf
    • https://cdn.shopify.com/s/files/1/0433/0350/1989/files/wagadoborufukubosagufo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6618/7176/files/ssat_practice_test_middle_level.pdf
    • https://cdn.shopify.com/s/files/1/0432/0323/1908/files/jiwirulujaveliwir.pdf
    • https://cdn.shopify.com/s/files/1/0435/5496/3617/files/developing_tactics_for_listening.pdf
    • https://cdn.shopify.com/s/files/1/0428/8489/0790/files/76058609689.pdf
    • https://cdn.shopify.com/s/files/1/0430/1537/2949/files/zopapinagakusewavan.pdf
    • https://cdn.shopify.com/s/files/1/0448/1653/1617/files/tchibo_cafissimo_picco_bedienungsanleitung.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/8167456974.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_off00006dca.bin
8a4f155708a864b618428efa91112d7670b842507aa607802ebce5cf34e80077
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DCA 5032 bytes
font_01_sfnt_off00007efd.bin
d837147d4ee1c91f6a2f6f134ec8722056417b83e0ce175d11335aababbab2ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EFD 10504 bytes