Malicious PDF — malware analysis report

Static analysis result for SHA-256 8248877c7a7fb6d9…

MALICIOUS

PDF

53.9 KB Created: 2020-08-15 20:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c984f75ed05511dea368b4a360914ada SHA-1: cd39ebf1fb39187f5cc3c9fd119ecfc1b735bf03 SHA-256: 8248877c7a7fb6d9c2d209f3c6f0653b6fa15f86cc2c310080b580d1bb4dcf73
152 Risk Score

Malware Insights

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

The PDF file contains a high number of embedded links, many of which point to external PDF files hosted on various domains, including Shopify. One of these links, 'https://ttraff.cc/wb?keyword=stay%20with%20me%20ukulele%20chords%20pdf', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic.

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.cc/wb?keyword=stay%20with%20me%20ukulele%20chords%20pdf
    • http://files.akadeltapsiomega.org/uploads/1/3/2/6/132696274/nasubetoki.pdf
    • http://files.jessicaouellette.com/uploads/1/3/2/6/132682281/zibavuzamebavad.pdf
    • http://files.createwithease.com/uploads/1/3/2/6/132682290/f796a44e3e.pdf
    • https://cdn.shopify.com/s/files/1/0437/7850/6904/files/13432831048.pdf
    • https://cdn.shopify.com/s/files/1/0430/3588/5725/files/7352780661.pdf
    • https://cdn.shopify.com/s/files/1/0437/7945/7175/files/paralutuloditezosojosoma.pdf
    • https://cdn.shopify.com/s/files/1/0434/5066/3073/files/felazugejiz.pdf
    • https://cdn.shopify.com/s/files/1/0454/6861/4808/files/antigona_kniha.pdf
    • https://cdn.shopify.com/s/files/1/0433/1051/4334/files/womokigogikusok.pdf
    • https://cdn.shopify.com/s/files/1/0433/6369/6799/files/tegewofaz.pdf
    • https://cdn.shopify.com/s/files/1/0439/1505/1163/files/85031287132.pdf
    • https://cdn.shopify.com/s/files/1/0431/8865/0142/files/taller_sobre_adjetivos_posesivos_en_ingles.pdf
    • https://cdn.shopify.com/s/files/1/0430/0741/0329/files/dunavavovokiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/duzawubemamomavokam.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/1/0433/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e24.bin
05ebe13a94efe71fc8f13d3c0bed14ede443ba68c38d17019f40a8dddc78e9a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E24 5756 bytes
font_01_sfnt_off000081a7.bin
44825b6e6bfec19817f251af87313020340babe26c78a0476ac37ae440d5e24e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81A7 16072 bytes
font_02_sfnt_off0000b3c4.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C4 16204 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.