Malicious PDF — malware analysis report

Static analysis result for SHA-256 63a3675b1619fa64…

MALICIOUS

PDF

48.7 KB Created: 2020-08-13 22:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac454e0469e378e9029859a3d1121489 SHA-1: 77604ec5186c4ed0472390548e97b1f13bdbb119 SHA-256: 63a3675b1619fa64bd171d0c367225917215134ccb8780d4f647b9e546356e1d
162 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 a link farm designed for SEO manipulation. One prominent link, https://ttraff.ru/pify?keyword=avadh+university+private+form+online+application, is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

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.ru/pify?keyword=avadh+university+private+form+online+application
    • http://wawonivud.derbycommunitychurch.com/uploads/1/3/0/7/130775085/wukojuvoj.pdf
    • http://files.ashtangaingroningen.com/uploads/1/3/1/8/131871633/ecb0f1edd7543.pdf
    • http://files.wss1sgradeib.com/uploads/1/3/1/4/131437632/wuruzufin_vukaxexebazuta_jagawotaxagoge_dorabisike.pdf
    • http://files.seedlingsystems.co/uploads/1/3/1/6/131607467/199821ec95fee.pdf
    • http://files.cbinderyservices.com/uploads/1/3/2/6/132681885/ligewu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/6803/8047/files/nero_stard_smart.pdf
    • https://cdn.shopify.com/s/files/1/0440/2728/1558/files/ncert_biology_class_11_morphology_of_flowering_plants.pdf
    • https://cdn.shopify.com/s/files/1/0436/0703/1966/files/93802336552.pdf
    • https://cdn.shopify.com/s/files/1/0437/6592/3992/files/3700226586.pdf
    • https://cdn.shopify.com/s/files/1/0435/8940/2779/files/45521882961.pdf
    • https://cdn.shopify.com/s/files/1/0436/4029/1486/files/wanigikada.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/unizik_admission_list_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/0129/8594/files/52517383034.pdf
    • https://cdn.shopify.com/s/files/1/0433/8352/1445/files/etiology_of_acute_diarrhea.pdf
    • https://cdn.shopify.com/s/files/1/0436/2692/2146/files/common_core_algebra_1.pdf
    • https://cdn.shopify.com/s/files/1/0430/9739/1261/files/89828599044.pdf
    • https://cdn.shopify.com/s/files/1/0436/1525/6738/files/xarixujolakafimoxapo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86662201832.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_off00006ced.bin
bff2e0fb1eeace3bc0f4c03f6f7303f740e3ddbaaf57e89af241bac452879be8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CED 5428 bytes
font_01_sfnt_off00007f3c.bin
a9ba6ef1b2c72e08d3d7a7e20c7d6d026c69f2299c6a73b0f954fe7e1188d621		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F3C 12600 bytes
font_02_sfnt_off0000a775.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA775 4324 bytes

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