Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb8a9953ed9eb3f8…

MALICIOUS

PDF

35.8 KB Created: 2020-10-15 11:42:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d33bdb426ba571c141d81c642c25ea8f SHA-1: 7a87adbdd099d7f456474399818a602b90e0a115 SHA-256: eb8a9953ed9eb3f8b8dbdc5200224528217111ad2f3947ab03340897f0bd4709
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of embedded links, many of which point to benign Shopify URLs, but one critical link directs to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the same product keyword found in the malicious URL, suggesting a lure for phishing or malware distribution. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent.

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://cctraff.ru/strik?keyword=black+satin+cowl+neck+dress+missguided In PDF document text
    • https://pepuzategazeg.weebly.com/uploads/1/3/1/4/131453576/dijimatubabot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366360/normal_5f87549f37854.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_5f87a5495ef6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_5f8700deb12c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365553/normal_5f87161e19192.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366337/normal_5f87bdfde3a1d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/9359/7601/files/sherlock_holmes_online_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/4291/9832/files/66567994072.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/2892/7896/files/rilapurasavuti.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/8276/0601/files/julazepevupuxewoxa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0491/8273/6550/files/ligudodizusikoridenigare.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0487/1284/3414/files/37629761687.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed283250-cdf3-4f36-a4cd-4c22d1b4cbcb/77801948591.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4a10e86-98b1-4229-bfe3-de9fc585f912/niluxirofokujake.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e8859ae-985c-4745-8199-e219863a104b/41167970235.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3b37bd3-4e37-40fe-baf4-d1ed41c96f6e/12577778709.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/4456/8989/files/doradelabe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0184/2328/files/xuravipezofera.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0491/8185/1814/files/wifi_tools_apk.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_off00004ec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4EC2 5464 bytes
SHA-256: e4550f4d0acbd9410ded6f45998054cead5383bd2ec6921c9c359a48b3e48398
font_01_sfnt_off00006150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6150 9536 bytes
SHA-256: 426121aa031ac1e83750897a4d1094c25d08797afc7881c2f308469f585d6b65

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