Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c9116bbb3addabc…

MALICIOUS

PDF

48.3 KB Created: 2020-08-23 04:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ba6b472e58044942bb362a4a1120964 SHA-1: 2a7b1af50515143d994bcfe7efab0c0e9d653e5f SHA-256: 5c9116bbb3addabc2c09f6e92ced31bbee10fe0d39d499b9cdea4f5ec07b723b
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and embedded links suggest a lure related to software, aiming to trick users into visiting malicious sites. The ML classifier also strongly indicated maliciousness.

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=vlc+video+player+for+android+tv
    • http://gibed.twinfishinterline.com/uploads/1/3/1/3/131398243/3b7f07f8e.pdf
    • http://files.nasiiclothingstore.com/uploads/1/3/1/8/131856852/zowutiwef-wiluz-bifuwuzafojiwoz-rerabigo.pdf
    • http://xeponuv.dovespalace.org/uploads/1/3/1/4/131453247/58111b356edbe9f.pdf
    • http://files.mobile-massage-sydney.com/uploads/1/3/1/3/131380985/velolenoz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/5398/9534/files/tejidopolibujawivaf.pdf
    • https://cdn.shopify.com/s/files/1/0430/1671/6437/files/puwolapalilirowulalu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7016/0032/files/metformina_efectos_secundarios_riones.pdf
    • https://cdn.shopify.com/s/files/1/0429/8774/9525/files/kawogupimogokexumojanilo.pdf
    • https://cdn.shopify.com/s/files/1/0447/8743/3623/files/el_alfabeto_hebreo_y_su_significado.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/reragijod.pdf
    • https://cdn.shopify.com/s/files/1/0429/5340/8675/files/47881990260.pdf
    • https://cdn.shopify.com/s/files/1/0431/0761/4882/files/vitulagowobujimabo.pdf
    • https://cdn.shopify.com/s/files/1/0437/3577/7445/files/ruziwijofitugefaputuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/5727/4270/files/88507753962.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071a8.bin
b4609b9cf07dc7d27aa1ab1ca8d36bbc3778e6dcf1838eeb5547567a0eb85f65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71A8 4884 bytes
font_01_sfnt_off00008254.bin
1babc96d6617cfe3302a556315bcdbca9a57a801ea50854b2a93d49965d6fe08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8254 10680 bytes
font_02_sfnt_off0000a696.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA696 4324 bytes

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