Malicious PDF — malware analysis report

Static analysis result for SHA-256 09d8b08faf4aa24c…

MALICIOUS

PDF

54.2 KB Created: 2020-11-08 11:37:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8b9e56f7793de2af3754b5e84b0f5c0 SHA-1: 5eef852bbe702481bfc8bdb0165e5fb2997d2ea7 SHA-256: 09d8b08faf4aa24c6605c69ce653714c012d5f39bf220b8d69ade5ebbc1cbc1c
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to benign-looking PDFs, suggesting a link farm or SEO manipulation tactic. The primary malicious URL identified is https://trafftec.ru/aws?keyword=yepi+unblocked+vex+2. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links indicate an attempt to drive traffic to potentially malicious or deceptive content, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafftec.ru/aws?keyword=yepi+unblocked+vex+2
    • https://bififofivajarat.weebly.com/uploads/1/3/4/3/134315789/cbbe6cf.pdf
    • https://zefufewik.weebly.com/uploads/1/3/4/3/134374544/5191e808edf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://vozakenot.files.wordpress.com/2020/11/keyence_gt2-75p_manual.pdf
    • https://bubapowi.files.wordpress.com/2020/11/causas_de_tenesmo_retal.pdf
    • https://tuxabavijig.files.wordpress.com/2020/11/37940387668.pdf
    • https://nenupewav.files.wordpress.com/2020/11/kixabowenuxijasawi.pdf
    • https://s3.amazonaws.com/pozokimepe/power_90_sculpt_3_4.pdf
    • https://s3.amazonaws.com/kibavutibeved/60335104280.pdf
    • https://desinijedugo.files.wordpress.com/2020/11/calligraphy_alphabet_practice.pdf
    • https://uploads.strikinglycdn.com/files/4c0928aa-44d1-48d5-bc9f-cbbba3f806f9/gasujalegamaxat.pdf
    • https://dilebelovi.files.wordpress.com/2020/11/labikorogete.pdf
    • https://pevolitu.files.wordpress.com/2020/11/54702731943.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0000a99c.bin
367a20a2019dd77692e1b755b220db0c475b38143d4755da16996a5829a78193
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA99C 19708 bytes
font_00_sfnt_off00006944.bin
4925a81319bbd9efa0dcb9b7c66fccd1fd8c2b9f5e9916edfa1d670e4d491518
pdf-font-stream PDF embedded font (sfnt) at offset 0x6944 3120 bytes
font_01_sfnt_off00007479.bin
1ff70f358aaa46d2db25b893a4a02700c22a3d36754363d45a30796a9bf00108
pdf-font-stream PDF embedded font (sfnt) at offset 0x7479 5008 bytes
font_02_sfnt_off000085a1.bin
80f563f063a688561e30df0b0a88e13132280479e1444ef48bca607284711dea
pdf-font-stream PDF embedded font (sfnt) at offset 0x85A1 11812 bytes