Malicious PDF — malware analysis report

Static analysis result for SHA-256 6345c6fd436eba97…

MALICIOUS

PDF

45.1 KB Created: 2020-08-15 20:40:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa4202bd880762f66ad4dbfbc25bdd10 SHA-1: 1b92157e1a66088d8b319d4900623ac7d364732e SHA-256: 6345c6fd436eba97a9f0d01c1fed6741beb28bf1d140d92d8497c336d49e3897
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.com/pify?keyword=surat+brts+app. Additionally, it exhibits characteristics of a link farm, embedding numerous external PDF links. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent. The embedded URLs suggest an attempt to lure users to potentially malicious content or phishing sites.

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=surat+brts+app
    • http://files.agprotocol.co.uk/uploads/1/3/1/4/131407952/6996046.pdf
    • http://files.pkaoki.com/uploads/1/3/1/0/131070313/voleb-zejujorikip-doserobonede.pdf
    • http://files.yilongliu.com/uploads/1/3/0/9/130969206/dirolo_vajobeje_kekonefiziwip_miripavuwo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0447/5407/5799/files/nurodumarij.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2687/files/62267204868.pdf
    • https://cdn.shopify.com/s/files/1/0434/2156/5078/files/80410075475.pdf
    • https://cdn.shopify.com/s/files/1/0435/0076/5336/files/rejolafimemum.pdf
    • https://cdn.shopify.com/s/files/1/0429/1778/9862/files/86380606901.pdf
    • https://cdn.shopify.com/s/files/1/0438/8900/0616/files/makoto_niijima_confidant_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/9839/1196/files/cp_plus_hd_cctv_camera_price_list.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3077/files/nutexo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1566/6840/files/libro_apologia_de_socrates_de_platon.pdf
    • https://cdn.shopify.com/s/files/1/0431/0594/3701/files/megaman_battle_network_3_walkthrough.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/kixetaxufun.pdf
    • https://cdn.shopify.com/s/files/1/0433/8073/6165/files/15608491689.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_off00006685.bin
89312d6038c6f8973f21bb4ad030f58be15f3b6f70675e2234dd9192f156c27c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6685 4524 bytes
font_01_sfnt_off000075d9.bin
a2c97f6beadbff169ccdfbffdd9392dd09e9a39829d766e62fdd66f1f3f8a068		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75D9 10544 bytes
font_02_sfnt_off000099eb.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99EB 4324 bytes

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