Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d24ff1f0387b8f6…

MALICIOUS

PDF

76.3 KB Created: 2020-08-04 20:33:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08ff52aedc19826d1626722fde2c720d SHA-1: 33fe806836df45304fcf1c7406a3d019523a517f SHA-256: 6d24ff1f0387b8f6c4446cb3452eb1d89e47d6f73fdee9b7966aa2c44ae6a280
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The presence of a 'download button' heuristic further suggests a social engineering attempt to trick the user into clicking the malicious link. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.com/pify?keyword=aditya+hrudayam+in+sanskrit+pdf
    • http://files.carpetcleaningsummerland.com/uploads/1/3/1/3/131383657/9684649.pdf
    • http://files.stettlercarclub.com/uploads/1/3/0/7/130738779/konoju.pdf
    • http://files.salsamama.org/uploads/1/3/0/8/130873830/lisetutakotufoxepis.pdf
    • http://files.irwinpta.org/uploads/1/3/0/9/130969089/parus_tigalutirexig.pdf
    • http://fedorahosted.org/lohit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3552/5282/files/43319633029.pdf
    • https://cdn.shopify.com/s/files/1/0428/4396/3548/files/suvelavapukitanabavogage.pdf
    • https://cdn.shopify.com/s/files/1/0430/3205/1873/files/77275404831.pdf
    • https://cdn.shopify.com/s/files/1/0433/7870/4549/files/wanenodisagosanodetox.pdf
    • https://cdn.shopify.com/s/files/1/0428/5811/9334/files/pafiwipavavaxamori.pdf
    • https://cdn.shopify.com/s/files/1/0439/2294/8251/files/73871366704.pdf
    • https://cdn.shopify.com/s/files/1/0430/4817/3722/files/73594045162.pdf
    • https://cdn.shopify.com/s/files/1/0435/5633/9861/files/37349692365.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nalekubaserigudopen.pdf
    • https://cdn.shopify.com/s/files/1/0429/7913/1551/files/29013659394.pdf
    • https://cdn.shopify.com/s/files/1/0433/6753/0655/files/10385129644.pdf
    • https://cdn.shopify.com/s/files/1/0435/5306/3063/files/nowabanojameritafilibox.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000e757.bin
bd764d64eb01bf103a1286dd09a623f17d083759ad2a7a50a80e308ef2b199f9		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE757 20308 bytes
font_00_sfnt_off00009b36.bin
99133c960e0d457ba9c803538f7edde98b2d87942de3511180c12b40c75a6eb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B36 5404 bytes
font_01_sfnt_off0000ad73.bin
4cd60777e265fafd80a6c4ac8a8f541642313e2b1c6670a3899fdf55b12f51bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD73 3772 bytes
font_02_sfnt_off0000b918.bin
d18acca691f853ac61841dafbe43393a3ff508f0f9da5b0e7457d50e7d408681		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB918 14924 bytes

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