Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ba6f03add25c161…

MALICIOUS

PDF

56.6 KB Created: 2020-08-09 04:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f286f4840d7b7acfe5d29875ed340a5c SHA-1: 5820bc5bf162fb8e828fd4b2ee451655aa9b59a2 SHA-256: 5ba6f03add25c161c31989601b4ee891bc3cd825e5272f6241948a2359efe291
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation. One prominent link, 'https://ttraff.cc/pify?keyword=bhu+msc+agriculture+entrance+exam+question+paper+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to academic content, likely a lure to encourage clicks on the malicious link.

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.cc/pify?keyword=bhu+msc+agriculture+entrance+exam+question+paper+pdf
    • http://files.bullengarookadultriders.com/uploads/1/3/1/6/131606408/tevuvibajuker.pdf
    • http://zesanaje.secondcitystationery.com/uploads/1/3/1/4/131407558/230ba2543e.pdf
    • http://vilugije.stmatthewsvoorheesville.net/uploads/1/3/1/4/131453645/3999960.pdf
    • http://files.alphatrucksolutions.com/uploads/1/3/1/8/131856907/burowigapaferedum.pdf
    • http://files.daisyhillacademy.us/uploads/1/3/0/8/130874658/noxofejivab-duvuraginaluv-detupojenoto.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0429/0543/6326/files/womazoxu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2917/6232/files/lomikofijatogilodebulij.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/1984_penguin_books.pdf
    • https://cdn.shopify.com/s/files/1/0432/2613/6743/files/data_structures_and_algorithms_in_python_2020.pdf
    • https://cdn.shopify.com/s/files/1/0448/1951/3506/files/the_broken_wings_khalil_gibran.pdf
    • https://cdn.shopify.com/s/files/1/0431/4041/5644/files/wusabep.pdf
    • https://cdn.shopify.com/s/files/1/0431/5847/0813/files/almas_gemelas_deepak_chopra.pdf
    • https://cdn.shopify.com/s/files/1/0429/8106/4853/files/descargar_libro_los_anunnaki.pdf
    • https://cdn.shopify.com/s/files/1/0434/1923/8562/files/1099-_hc_vs_1095-_b.pdf
    • https://cdn.shopify.com/s/files/1/0431/6158/3776/files/amidah_prayer_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0427/4687/1974/files/15164090121.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e97.bin
d03ab5f1ef9b8f864db38953d78f117c255fe1d455be0935bbe56863e6a83442		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E97 5812 bytes
font_01_sfnt_off00008231.bin
7bb91423d63eb6bd7c2657278979848d60b7d38679106ec23dbd755ba6ab3d32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8231 2320 bytes
font_02_sfnt_off00008c81.bin
63ca5a9626420e3117869493ecf56ed5a3e2f8020e3ade380f5a328822880a2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C81 10128 bytes
font_03_sfnt_off0000af1c.bin
5f3bf50395e8d1b65f29ab90a426c3665da69f8437ae50e88eef237d5e22552a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF1C 16224 bytes
font_04_sfnt_off0000c4a3.bin
6c49b360a1dc8ee4ce18d8e17ac7bf80f304a80c62d0841f2d7207edff842adb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A3 3976 bytes

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