Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e95a891657196d9…

MALICIOUS

PDF

49.0 KB Created: 2020-07-30 18:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f545eb7e53424d3af404b5200552f596 SHA-1: 638a29cab7725617741e84cb7e6b999cebefbd64 SHA-256: 1e95a891657196d9882c685ea06c2ddfb924df13d319d37c96bfc8022af0ad40
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of external links, suggesting a link farm for SEO manipulation or malicious redirection. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to a 'Bloodborne guide pdf download' lure.

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=bloodborne+guide+pdf+download
    • http://files.lexihut.com.au/uploads/1/3/2/6/132682868/7908340.pdf
    • http://files.leadersoflanier.com/uploads/1/3/0/7/130739375/3705428.pdf
    • http://files.seaspiritstudios.com/uploads/1/3/1/3/131398498/robabuboji.pdf
    • https://cdn.shopify.com/s/files/1/0438/8657/5771/files/nemuvosesubomevutalaked.pdf
    • https://cdn.shopify.com/s/files/1/0431/1387/3569/files/1149058203.pdf
    • https://cdn.shopify.com/s/files/1/0428/6083/9079/files/8678512276.pdf
    • https://cdn.shopify.com/s/files/1/0435/8746/9469/files/54163077394.pdf
    • https://cdn.shopify.com/s/files/1/0430/6668/7639/files/88419636487.pdf
    • https://cdn.shopify.com/s/files/1/0433/3636/8283/files/rolajukaxalodesidofopi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6174/7605/files/46301634361.pdf
    • https://cdn.shopify.com/s/files/1/0431/9579/3557/files/2771897560.pdf
    • https://cdn.shopify.com/s/files/1/0434/8005/5965/files/97628369295.pdf
    • https://cdn.shopify.com/s/files/1/0432/0644/3163/files/xizagibivo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6335/3250/files/mofegugufopolulilonev.pdf
    • https://cdn.shopify.com/s/files/1/0431/1551/1964/files/88565145797.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/
    • https://cdn.shopify.com/s/files/1/0430/6668/7639/files/88419636487

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000839d.bin
a6d316af03b8f25103fcab81c81e5ef2941c87f07b40342f2aa43d04fa51bedd
pdf-font-stream PDF embedded font (sfnt) at offset 0x839D 5112 bytes
font_01_sfnt_off0000951b.bin
6f6ef67960dca924285317f13998709165ea588d01b32b3d082de20a42fb7ceb
pdf-font-stream PDF embedded font (sfnt) at offset 0x951B 9892 bytes