Malicious PDF — malware analysis report

Static analysis result for SHA-256 71d566adc881fcf1…

MALICIOUS

PDF

53.0 KB Created: 2020-08-14 04:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1abcf5df8f9204749fb4712a7f86860 SHA-1: 1175817d87f035660f4c477ef1b8ba9951b11bdb SHA-256: 71d566adc881fcf1087bebdfdc7f0535626c6d2c697640a5c61a37c64aeb13ec
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure for SEO poisoning or to distribute further payloads. No scripts were extracted, but the PDF structure itself is used for malicious redirection.

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.com/pify?keyword=assamese+babur+gaan
    • http://files.felicecurcelli.net/uploads/1/3/2/6/132680932/8c7d9e.pdf
    • http://sapuwow.kenpodvd.com/uploads/1/3/1/0/131069759/95e039.pdf
    • http://wajisib.lilianafijman.com/uploads/1/3/1/4/131437421/3483788.pdf
    • http://jevade.danitzaorendain.com/uploads/1/3/1/6/131636719/fexebegevinaxi_mipaxonijumej.pdf
    • http://julemoro.theblessedlifeonline.com/uploads/1/3/0/7/130775918/9b504fcef13c58.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/3118/3016/files/mapa_metro_2020.pdf
    • https://cdn.shopify.com/s/files/1/0435/6459/7397/files/arbitration_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0428/5769/3347/files/8062680784.pdf
    • https://cdn.shopify.com/s/files/1/0429/9200/9365/files/gobumitajajomu.pdf
    • https://cdn.shopify.com/s/files/1/0430/2969/2577/files/rorudagupateromenijetigub.pdf
    • https://cdn.shopify.com/s/files/1/0429/4482/3452/files/65697348758.pdf
    • https://cdn.shopify.com/s/files/1/0434/6665/3858/files/c_subset_of_vector.pdf
    • https://cdn.shopify.com/s/files/1/0431/0702/5056/files/4208297625.pdf
    • https://cdn.shopify.com/s/files/1/0433/6346/7414/files/20282269186.pdf
    • https://cdn.shopify.com/s/files/1/0431/7731/2411/files/wafadidoniwumuxopiwar.pdf
    • https://cdn.shopify.com/s/files/1/0435/1688/7192/files/lixerulitogapajulazaxoj.pdf
    • https://cdn.shopify.com/s/files/1/0430/1576/6177/files/celebrity_skin_tab.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
font_00_sfnt_off00006b56.bin
7c6b3640c2548c04d48c822527cece32236202f3b5529dfb21cc514163ab0dd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B56 4748 bytes
font_01_sfnt_off00007b3b.bin
ae6cb00147541525452b7980cd4032d738e03008f72b6b60eff10b36a9500ea8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B3B 4684 bytes
font_02_sfnt_off000089c6.bin
13a303e61545695edb86d369436c3bbe48c3e064e2352d40a04753afc34e02e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89C6 14708 bytes
font_03_sfnt_off0000b8f0.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F0 4324 bytes

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