Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a5748c18de87a60…

MALICIOUS

PDF

60.1 KB Created: 2020-10-28 23:09:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8a99cb2104c2ba7e5d235364c7c5355 SHA-1: 5d45af2c34dc7394ac217fe90115d08cb63aa35a SHA-256: 2a5748c18de87a6098be1e87ebe22dd68ce5fd9d91e1f982f34d74e0c2300723
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure and link farms. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the document body and heuristics suggest a malicious intent to redirect users to potentially harmful sites, possibly for phishing or SEO spam.

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://gettraff.ru/strik?keyword=divine+child+high+school
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/0f50fa66b22.pdf
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/9247351.pdf
    • https://xavubetikobu.weebly.com/uploads/1/3/4/4/134474291/8756545.pdf
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/9639254.pdf
    • https://rejigebejone.weebly.com/uploads/1/3/4/4/134462336/wivimuv_zumamagizonax_texuzokipopofen_lipujalafa.pdf
    • https://kerumesuni.weebly.com/uploads/1/3/4/1/134131613/2530168.pdf
    • https://bituxusod.weebly.com/uploads/1/3/4/3/134347303/cae1c78.pdf
    • https://jijalasigode.weebly.com/uploads/1/3/4/3/134344414/6306769.pdf
    • https://mefemanodi.weebly.com/uploads/1/3/1/4/131454269/0836f2c35d91f.pdf
    • https://rajaxamakato.weebly.com/uploads/1/3/2/3/132302926/gafajifinime-lavodefikav-dilutitibol-nogunajizanug.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0488/2772/8037/files/difference_between_aerobic_and_anaerobic_fermentation.pdf
    • https://cdn.shopify.com/s/files/1/0486/5805/5318/files/mianus_river_park_map.pdf
    • https://cdn.shopify.com/s/files/1/0507/0487/5680/files/icd_10_download.pdf
    • https://uploads.strikinglycdn.com/files/8530a52a-0373-4c56-8d5a-0ef65e6fdc3e/85456813778.pdf
    • https://uploads.strikinglycdn.com/files/aa73c9ba-58f2-4f35-85ed-25a87bc5b95b/wejelajimosekasediku.pdf
    • https://cdn.shopify.com/s/files/1/0431/9471/2228/files/malay_apple_tree.pdf
    • https://cdn.shopify.com/s/files/1/0484/7855/2218/files/jadoxufivakimojival.pdf
    • https://cdn.shopify.com/s/files/1/0500/1032/5150/files/runaxu.pdf
    • https://cdn.shopify.com/s/files/1/0498/7492/7774/files/programa_para_converter_para_excel_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0481/1944/7714/files/esl_medical_vocabulary.pdf
    • https://uploads.strikinglycdn.com/files/d437b4ac-ad8f-49d3-9d75-cd342ae3487e/96461703431.pdf
    • https://uploads.strikinglycdn.com/files/f27a432d-49b9-4975-8509-09b21d54befc/66689973657.pdf
    • https://cdn.shopify.com/s/files/1/0501/3032/1568/files/last_drive_in_twitter.pdf
    • https://cdn.shopify.com/s/files/1/0497/1593/7441/files/19267537537.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ab3d.bin
880329769e328e87595626c3f5878c02d49bebc608ec9eb1bc890a5273345e99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB3D 4952 bytes
font_01_sfnt_off0000bc28.bin
156bafd51a7b77f029af4a4f42f5040e7e933f5ff5da93c5bd792f7b9bfcb7c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC28 11712 bytes

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