Malicious PDF — malware analysis report

Static analysis result for SHA-256 915e42359b602b42…

MALICIOUS

PDF

42.2 KB Created: 2020-11-01 10:12:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: dc03b9b8e81274030837c84a09bac636 SHA-1: 898fe4d6db8d028a7e7c0a5fbe8c14e9f2750b60 SHA-256: 915e42359b602b423f612513ac97979f43a14b3da1b48fecb484e5f1515cf11b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags the URL 'https://ttraff.ru/123?keyword=cassadaga+valley+central+school+alumni' as malicious. The 'PDF_SEO_LINK_FARM' heuristic indicates the document is designed to host numerous external links, likely for SEO manipulation or to distribute malware. No scripts were extracted, but the primary attack vector appears to be the embedded links.

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/123?keyword=cassadaga+valley+central+school+alumni In PDF document text
    • https://walijogopabo.weebly.com/uploads/1/3/0/7/130776167/bevusirobute.pdfIn PDF document text
    • https://romovemesokawaj.weebly.com/uploads/1/3/4/4/134479736/5688394.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/winepogor.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/wivovisorokinewu.pdfIn PDF document text
    • https://suzokixuvajix.weebly.com/uploads/1/3/0/7/130776208/4800481.pdfIn PDF document text
    • https://luwamagol.weebly.com/uploads/1/3/4/3/134375262/nalijajuzis.pdfIn PDF document text
    • https://xegilebul.weebly.com/uploads/1/3/4/3/134347284/5766500.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/bifamomove/lilawu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/4061/0753/files/cant_sign_in_android_google_account.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0507/6359/5967/files/bizegesomeluburisatori.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/9682/5764/files/geometry_surface_area_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4782/2236/files/kindergarten_spelling_inventory_words_their_way.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0487/9227/3061/files/page_test_imprimante_couleur.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_off00005652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5652 5420 bytes
SHA-256: b380ff4a001b8f76c39bd3a9842665e3cce4d02075d638f876780fbeeb134b56
font_01_sfnt_off0000689a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x689A 10784 bytes
SHA-256: f57da4a0193bdc596fd051aef3207920a166281dec18376875bc88c3ae255731
font_02_sfnt_off00008d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D63 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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