Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9609dc3037b7b28…

MALICIOUS

PDF

38.2 KB Created: 2020-10-31 06:58:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ce1e91e985b6e548297c00237eb23253 SHA-1: eb611bf5be414b8dde9c6974b55910d6323dc35f SHA-256: e9609dc3037b7b28ffa8ff4115ffae072769a1e2bb7a7eb912aa1490708adb40
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with the primary link pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body itself contains obfuscated text and URLs, suggesting an attempt to disguise the malicious intent and potentially evade detection. The presence of numerous external links indicates a link farm or phishing attempt.

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://ggtraff.ru/123?keyword=a+midsummer+night%2527s+dream+no+fear+pdf In PDF document text
    • https://bizumoku.weebly.com/uploads/1/3/2/6/132681494/femidi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370269/normal_5f8bc7f52f59e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366029/normal_5f86fc2bef46f.pdfIn PDF document text
    • https://birisudim.weebly.com/uploads/1/3/4/4/134467091/redemavoxipux.pdfIn PDF document text
    • https://ligofaxudatejot.weebly.com/uploads/1/3/0/7/130739538/nidifoxumerirejepo.pdfIn PDF document text
    • https://liziruji.weebly.com/uploads/1/3/4/3/134380663/4604344.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zakunafu/95892293059.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0467/9955/2663/files/sonese.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4885/2885/files/risomote.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/1701/3912/files/ethiopian_civil_wars.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/1410/3462/files/41801630055.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/84146232484.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/8534/6998/files/vamugakuvebozapujepimi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000487c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x487C 5328 bytes
SHA-256: ad42da585a3842a600a9c1d78f05181046c05e1814c967ff8d467bea6c66601b
font_01_sfnt_off00005a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A6A 10352 bytes
SHA-256: e2155ca145d67b9ae7c236d25fe3d02cfc39a6940391081aaa28346fbec3eae2
font_02_sfnt_off00007dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DEC 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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