Malicious PDF — malware analysis report

Static analysis result for SHA-256 034d5eabd23aaa42…

MALICIOUS

PDF

37.2 KB Created: 2020-08-10 02:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c8ef819fc13ea299f26fa0b51d280a5 SHA-1: cd59021461d3b42a20bcf653ab5846333fb1d809 SHA-256: 034d5eabd23aaa42b65f3d284a0542154b1161045319e2b02851090ee0129f78
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a download for a PDF file, which is a common tactic for phishing and scam campaigns. The ML classifier strongly indicated maliciousness, and the presence of numerous external PDF links, some pointing to potentially malicious infrastructure, supports this. Although no scripts were extracted, the embedded URLs and the overall structure suggest an attempt to redirect users to malicious content.

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=ardas+download+pdf
    • http://files.billboudreau.com/uploads/1/3/0/8/130813694/gudabuwugomet_sovajejafamebat_nipoganukezo_sexom.pdf
    • http://files.tamukhornstudio.com/uploads/1/3/2/6/132695525/varijone.pdf
    • http://files.gravesbjj.com/uploads/1/3/1/6/131606465/4787847.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0435/3998/8648/files/gm_manual_transmission_casting_numbers.pdf
    • https://cdn.shopify.com/s/files/1/0433/5288/3352/files/29982987231.pdf
    • https://cdn.shopify.com/s/files/1/0431/1800/2340/files/how_to_save_openoffice_as.pdf
    • https://cdn.shopify.com/s/files/1/0435/4641/1167/files/11428528858.pdf
    • https://cdn.shopify.com/s/files/1/0430/9070/6599/files/medical_fitness_certificate_for_neet_ug_2020.pdf
    • https://cdn.shopify.com/s/files/1/0447/0757/8009/files/bebop_scales_guitar.pdf
    • https://cdn.shopify.com/s/files/1/0440/5598/6326/files/adjective_and_adverbs_list.pdf
    • https://cdn.shopify.com/s/files/1/0434/3431/1845/files/webofirupexoweparakur.pdf
    • https://cdn.shopify.com/s/files/1/0429/6966/1589/files/bemugavonujuzuwivajuvipub.pdf
    • https://cdn.shopify.com/s/files/1/0428/8803/6505/files/46157244530.pdf
    • https://cdn.shopify.com/s/files/1/0428/1093/3414/files/89246742686.pdf
    • https://cdn.shopify.com/s/files/1/0435/5820/7651/files/nunegonikonosaluledages.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wogol.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_off000048d1.bin
6a6fceb99513d9f898551add61ab4c78a56c4e9b39894429bc7fd5b6cddbacd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48D1 5116 bytes
font_01_sfnt_off00005a59.bin
ff220c03ae0f84f1fdd7009bf6165980df645bf374739ffe42f217b73cedf923		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A59 2560 bytes
font_02_sfnt_off00006559.bin
8d08aa7d6724d5f84f88247415e738326d03e884ecc411af8dd368722f84422f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6559 10164 bytes

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