Malicious PDF — malware analysis report

Static analysis result for SHA-256 78103f553c6e647b…

MALICIOUS

PDF

46.6 KB Created: 2020-08-15 01:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5029a02aee7979b9ad491103ddbc45f SHA-1: 9b084571ac4b404defec310d5cf55d7c6a7d3ce1 SHA-256: 78103f553c6e647ba709208f3c57982137251d18c2c9df25bd96991d34a90659
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a malicious redirector link that points to a URL designed to lure users with a search query. This is further supported by the PDF_SEO_LINK_FARM heuristic, indicating a large number of links, likely for SEO manipulation or to host further malicious content. 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.ru/pify?keyword=carsguide+rav4+2019
    • http://rijafi.videoartcarmenkordas.com/uploads/1/3/1/6/131637339/zuzebovilalafir.pdf
    • http://files.uscequestrian.org/uploads/1/3/0/7/130776573/firavuke.pdf
    • http://files.bbluntsheabutter.shop/uploads/1/3/1/3/131383018/bajof.pdf
    • http://xotalax.lllofmenh.org/uploads/1/3/0/9/130969873/726055.pdf
    • http://files.newyorkhomescholars.com/uploads/1/3/0/8/130874361/jemanowara-majevujomi-jufagadawi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/0905/6668/files/les_accords_de_guitare_gratuit.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/lojiliwuvuram.pdf
    • https://cdn.shopify.com/s/files/1/0430/1747/0101/files/how_to_open._ai_files.pdf
    • https://cdn.shopify.com/s/files/1/0451/3749/4169/files/3437207447.pdf
    • https://cdn.shopify.com/s/files/1/0432/3501/6863/files/82205737679.pdf
    • https://cdn.shopify.com/s/files/1/0431/1616/7319/files/agency_theory_corporate_governance.pdf
    • https://cdn.shopify.com/s/files/1/0443/9467/6390/files/david_alandete.pdf
    • https://cdn.shopify.com/s/files/1/0433/4298/7422/files/cambridge_preliminary_english_test_for_schools_1_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/3001/0273/files/atharva_veda_in_tamil_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/0426/4601/files/shri_ganesh_atharvashirsha_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0438/7930/1275/files/segagakopijid.pdf
    • https://cdn.shopify.com/s/files/1/0431/0866/3456/files/xulowukoxokivuwekimoxiver.pdf
    • https://cdn.shopify.com/s/files/1/0429/9754/7157/files/40180406172.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_off00006b50.bin
1860b408a5617b793ffa5be3aa2345673c7aee4ba937e61a32a48b3cde88321d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B50 5200 bytes
font_01_sfnt_off00007d1a.bin
7f9837bad7a692a6394ecb08b227fec36bd25a2547b2c3919a1828b65ef47c1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D1A 10068 bytes
font_02_sfnt_off00009f85.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F85 4324 bytes

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