Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d914f59bbefecd7…

MALICIOUS

PDF

45.0 KB Created: 2020-10-27 14:46:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: afbf3212c90c19e6ce03a31226c1ac8d SHA-1: 847f51c4b612d0201105a15b1e01452f7f22a554 SHA-256: 1d914f59bbefecd7a4231fe2f6fecca326796496f7e7694240edf283775c850f
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm or SEO manipulation scheme, aiming to direct users to malicious infrastructure.

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://gettraff.ru/strik?keyword=rippowam+middle+school+calendar In PDF document text
    • https://runebipunozup.weebly.com/uploads/1/3/1/4/131406604/d74a5f40.pdfIn PDF document text
    • https://fupexorugukemig.weebly.com/uploads/1/3/0/8/130814763/goneru-jofope-wizagifikojon.pdfIn PDF document text
    • https://fijateri.weebly.com/uploads/1/3/4/3/134371572/2579979.pdfIn PDF document text
    • https://kudumegowejo.weebly.com/uploads/1/3/4/2/134266354/xezasulufimatuxufemo.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/pokobu-pidoror-pekirez.pdfIn PDF document text
    • https://rugurujumififez.weebly.com/uploads/1/3/1/3/131384765/tesokor.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://cdn.shopify.com/s/files/1/0495/9672/7460/files/ruff_and_reddy_show.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3963/2793/files/taduralugukukora.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/1415/9040/files/shapiro_md_shampoo_before_and_after.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/1112/3611/files/lsat_powerscore_bible.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/5328/4008/files/renal_function_test_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/1882/9991/files/fuvobafinejuwo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/8986/9991/files/97534604756.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5478/7477/files/instagram_video_download_app_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84944e72-9e80-4c89-83d1-8aa73a55bf07/73962492017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b942b740-5d5b-4f74-be5b-e9d684e3589c/vaxanatuxunikowuvofiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e063d27a-b04f-496f-a9e6-4d821bd5ec46/ruxufizififul.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_off000065df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65DF 5120 bytes
SHA-256: 96b7dafe2af2f48630d2873e042baabffffe3496f3c977a13be72cd6581d4db9
font_01_sfnt_off00007721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7721 9836 bytes
SHA-256: 2da2024fdda319e70926a6220e9ae45e05aa1b07f1b292a49c5fd8fbedd36361
font_02_sfnt_off000098d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98D8 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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