Malicious PDF — malware analysis report

Static analysis result for SHA-256 57ef9efec31647e3…

MALICIOUS

PDF

40.2 KB Created: 2020-08-29 11:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c89ca3974208517ee731e3f2a451ca48 SHA-1: 244aba96c78e6bf464db3ff9b200d873b42e4384 SHA-256: 57ef9efec31647e391e249aad3602434fe353dbc10d6053643b2ca318ceeb7ed
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 critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of an SEO link farm, embedding numerous links, with the primary malicious URL being 'https://ttraff.link/wix?keyword=om+namo+venkatesaya+chanting+mp3+fre'. The document body, though heavily obfuscated, also contains this URL and other Shopify links, suggesting a lure to external 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.link/wix?keyword=om+namo+venkatesaya+chanting+mp3+fre
    • https://cdn.shopify.com/s/files/1/0431/3484/5079/files/rowazujadigax.pdf
    • https://cdn.shopify.com/s/files/1/0441/1087/2728/files/java_8_api_documentation_offline.pdf
    • https://cdn.shopify.com/s/files/1/0429/3564/8409/files/55375919.pdf
    • https://cdn.shopify.com/s/files/1/0430/7098/0245/files/agent_carter_movie_in_tamil_dubbed.pdf
    • https://cdn.shopify.com/s/files/1/0434/0531/2154/files/15399971669.pdf
    • https://cdn.shopify.com/s/files/1/0435/2563/6248/files/67728994744.pdf
    • https://cdn.shopify.com/s/files/1/0431/2514/5760/files/nixuwozikef.pdf
    • https://cdn.shopify.com/s/files/1/0430/0672/2211/files/simile_and_metaphor_lesson_plan.pdf
    • https://cdn.shopify.com/s/files/1/0440/0496/6565/files/impulse_physics_worksheet_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/6642/4486/files/wifeselopimobinud.pdf
    • https://cdn.shopify.com/s/files/1/0431/9323/7665/files/23098561156.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_off000050ce.bin
70692ea497c2a87999e355f42b3b480473723eb5ab4751ead5df855e9adfc475
pdf-font-stream PDF embedded font (sfnt) at offset 0x50CE 5600 bytes
font_01_sfnt_off000063be.bin
4dd4fb72dcd515b94bb0848fa11faf50b784327e3fe87d2e2e9b9c4252b5a2ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x63BE 10000 bytes
font_02_sfnt_off000085f0.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x85F0 4324 bytes