Malicious PDF — malware analysis report

Static analysis result for SHA-256 8298e4a86b548bff…

MALICIOUS

PDF

52.3 KB Created: 2020-08-21 15:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bf5a539a4a2cbe76360d0a5779bdba9 SHA-1: c5176d379c3c3f9ccbef33138c32275ef0cd8207 SHA-256: 8298e4a86b548bff6cc47d329dfd78f4d45b5dc549a0e7f35ccb43163a55ab65
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a significant number of embedded links. One of these links, 'https://ttraff.ru/pify?keyword=pinterest+dark+mode+on+android', points to a known malicious redirector. The document also features a large number of links to PDF files hosted on Shopify, suggesting a link farm or SEO manipulation tactic. The presence of these malicious and numerous links indicates a likely attempt to lure users to malicious infrastructure.

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=pinterest+dark+mode+on+android
    • http://files.casinographics.com/uploads/1/3/1/3/131379828/d16c375b00461f8.pdf
    • http://lorenoba.auntyjoys.com/uploads/1/3/0/7/130739783/8879536.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/bruner_theory_in_the_classroom.pdf
    • https://cdn.shopify.com/s/files/1/0440/1309/3029/files/barron_s_sat_math_level_2.pdf
    • https://cdn.shopify.com/s/files/1/0434/0560/7070/files/96771575003.pdf
    • https://cdn.shopify.com/s/files/1/0438/0770/3201/files/rusedifa.pdf
    • https://cdn.shopify.com/s/files/1/0431/4447/8874/files/best_sims_3_mods_to.pdf
    • https://cdn.shopify.com/s/files/1/0432/6840/7464/files/80769813084.pdf
    • https://cdn.shopify.com/s/files/1/0429/7195/5351/files/new_headway_beginner_student_s_book_third_edition_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/3292/8671/files/niwepeberobafevale.pdf
    • https://cdn.shopify.com/s/files/1/0439/3864/4123/files/how_to_write_fiction_book.pdf
    • https://cdn.shopify.com/s/files/1/0435/5470/1463/files/arguments_against_euthanasia.pdf
    • https://cdn.shopify.com/s/files/1/0429/6966/1589/files/82239326200.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007a17.bin
68c44076c295d27b17756c0c98f6445c866fb92b019afd2d3a3b4e0d8e8669ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A17 5004 bytes
font_01_sfnt_off00008afe.bin
0c2b5449f50bc41bb0858f2e4c7f0a4d3fe60797c91e43a2276b2559205cb077
pdf-font-stream PDF embedded font (sfnt) at offset 0x8AFE 11032 bytes
font_02_sfnt_off0000af5f.bin
3b2933117f478ade8ef87cf495621bf0e8cfd730189764bca060bc56a7d59f99
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF5F 16072 bytes