Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f0291ce995db40…

MALICIOUS

PDF

82.6 KB Created: 2020-11-04 02:54:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b0d5d70140872f571da31070c046dc5 SHA-1: 1bd60d75f40c93d131cb13b4ef19dd0dc75d9b3b SHA-256: e1f0291ce995db40813741a03e659af027f81ea3ba04cd566af645fcf3411187
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier also flagged this PDF with high confidence. The document body contains obfuscated text and URLs, suggesting an attempt to lure users to malicious sites. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/aws?keyword=after+million+what+next
    • https://nijubalalo.weebly.com/uploads/1/3/1/4/131453980/5322233.pdf
    • https://fikifiwokadekaw.weebly.com/uploads/1/3/4/5/134585034/bukosulu.pdf
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/larulepa.pdf
    • https://kawigijutugin.weebly.com/uploads/1/3/4/3/134351661/tibules.pdf
    • https://jemiwuwavaza.weebly.com/uploads/1/3/0/8/130814288/bibesekukemugedovofa.pdf
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/kirorafagosox.pdf
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/837046.pdf
    • http://www.opentle.org
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/fonazuzixagizir/65556562707.pdf
    • https://s3.amazonaws.com/fosawef/zizotobemapupebimifajane.pdf
    • https://uploads.strikinglycdn.com/files/bda54bb1-8590-406d-977a-104ac50c882b/treble_clef_notes_cheat.pdf
    • https://s3.amazonaws.com/wejalixex/piwolelinukasegugilurutu.pdf
    • https://s3.amazonaws.com/jotizifime/ctet_2019_answer_key_download.pdf
    • https://s3.amazonaws.com/sowewazulejewi/ascending_order_worksheets_for_grade_1.pdf
    • https://uploads.strikinglycdn.com/files/dbebdcf3-da66-4489-a6fe-5887d9ee0db1/laxuduroxuvutekenif.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://www.gnu.org/licenses/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000c3da.bin
4ee31e2e8cb201caafab40cd8af3940ed1916a1d5816cd8704feddfe980e0584		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC3DA 14852 bytes
font_00_sfnt_off0000b3e2.bin
9e12908d81dd8d9c802e21fe20b5654358a54b397dd490e2d8038aca159cad68		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E2 4768 bytes
font_02_sfnt_off0000ee36.bin
e55458aa82b71c956bfd1b239028d5792a778a1490c1cfd8efda1e4eabec763f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE36 12740 bytes
font_03_sfnt_off0001184b.bin
1c6e6bf08e6448c19ed92c66ace668b32d382fe21d160e4e9791aa0b19e2e487		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1184B 16172 bytes
font_04_sfnt_off00012d76.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D76 4324 bytes

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