Malicious PDF — malware analysis report

Static analysis result for SHA-256 0459d9a8f03a4ff8…

MALICIOUS

PDF

57.4 KB Created: 2020-08-06 18:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d5d43a2bd61802083b1e39298a2d62f SHA-1: dacbb5fece3f87efadd60abe432fc944170cb915 SHA-256: 0459d9a8f03a4ff88f2a74c7aaa043c36779a00767c1788c539d1c56dbdbc07b
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 external PDF files hosted on various domains, suggesting a link farm. One of the primary links, https://ttraff.ru/pify?keyword=pseudobombax+ellipticum+pdf, is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and embedded URLs, further supporting the malicious intent.

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/pify?keyword=pseudobombax+ellipticum+pdf
    • http://files.lifeoflongearion.com/uploads/1/3/0/8/130813906/8184812.pdf
    • http://vifef.seratrevor.com/uploads/1/3/1/4/131453574/nefeduk-vugotudeb-fotireras-woges.pdf
    • http://files.doityourselfdocumentaries.com/uploads/1/3/2/7/132740423/1718c40bfb9c.pdf
    • http://files.lavernesartpotfolio.com/uploads/1/3/2/6/132695531/985f572576c6d.pdf
    • http://files.mictkinofest.com/uploads/1/3/2/7/132740694/38e60.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/4628/1122/files/mebubamekisasilemaf.pdf
    • https://cdn.shopify.com/s/files/1/0434/5937/9357/files/pendidikan_kewarganegaraan_di_amerika_serikat_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0432/4173/4307/files/55739134442.pdf
    • https://cdn.shopify.com/s/files/1/0431/2095/1458/files/63590144660.pdf
    • https://cdn.shopify.com/s/files/1/0431/6030/5825/files/27284911554.pdf
    • https://cdn.shopify.com/s/files/1/0436/2102/3904/files/windows_7_configuration_lab_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/2036/1629/files/zygmunt_bauman_liquid_love.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4263/files/nopexez.pdf
    • https://cdn.shopify.com/s/files/1/0429/6271/4773/files/aaron_lewis_country_boy_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/8620/8406/files/82078035320.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/punuf.pdf
    • https://cdn.shopify.com/s/files/1/0432/4347/1003/files/gt_recovery_app.pdf
    • https://cdn.shopify.com/s/files/1/0431/5879/8492/files/statistical_analysis_of_microbiome_data_with_r_pdf.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://scripts.sil.org/OFL
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069ee.bin
f7b58cf39bfd48a8d94c55bf69bad18246ca39436c888a1a2739630d3d7ddcee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69EE 4140 bytes
font_01_sfnt_off000078a3.bin
0249d293ba605aec8ffc109102ca882c07c479c4b479f35f7da78f89f44fc876		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78A3 5192 bytes
font_02_sfnt_off00008a53.bin
0451fc40e35afee0a632edce4c9c519d9b80aa16ead900ce33091689dbb23144		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A53 5472 bytes
font_03_sfnt_off00009c1e.bin
36ff1b76b0f9a7b563d2c9720e6f6c17988ac58f33b8e36c62683322a8d2f96d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C1E 14308 bytes
font_04_sfnt_off0000c995.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC995 4324 bytes

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