Malicious PDF — malware analysis report

Static analysis result for SHA-256 11892b073f11a733…

MALICIOUS

PDF

47.1 KB Created: 2020-10-27 18:57:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 779c4eb6e8e589ab06c859a2142a1d3b SHA-1: db74ed22203856c147d76ae4e4d1a3ab2a1c336b SHA-256: 11892b073f11a7332ef25cf51096fded08667c603dedd04a1bf0a7fc6c907826
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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.link/123?keyword=green+screen+images+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382771/normal_5f920894d3d6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391015/normal_5f8e8623aab14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389370/normal_5f8ff10a492d6.pdfIn PDF document text
    • https://javodamujuwevef.weebly.com/uploads/1/3/4/4/134446411/felaxujug-tuxuliwelonatu-kowololojev.pdfIn PDF document text
    • https://wosezobar.weebly.com/uploads/1/3/1/8/131856012/putubomutizona.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/kitodobamakumekufa.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/1/0438/6534/2117/files/mimedx_criminal_investigation.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/9865/0797/files/73889359766.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/7136/3014/files/zarupewobefoxixuxevozolup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2843/3054/files/candy_crush_soda_apk_download_hack.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7506/8606/files/bulejezopegu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9245/2547/files/67531093750.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8950/9017/files/coleman_coffee_maker_carrying_case.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7824/4765/files/stp_file_open_in_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2431/8103/files/zedotukukagafixiborom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/4170/1026/files/magic_arena_macbook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2818/4739/files/80213099734.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_off00006e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E21 4796 bytes
SHA-256: 40db7b64aa7022780b96497f45fb9453ea2c8cbd9f6fa2f34507422db69e556a
font_01_sfnt_off00007e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E48 10076 bytes
SHA-256: 22ed0996df9678cc6c8092ee67444711c3e1bd48569b6b1fd2ba7c820055f53a
font_02_sfnt_off0000a0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA0CB 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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