Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4cae7fddc28f045…

MALICIOUS

PDF

45.3 KB Created: 2020-08-25 00:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef9e728203cd36abe7fc68e3fe41d67f SHA-1: bb1003f8d8391c6def05fa43d03c63c8af681d6f SHA-256: a4cae7fddc28f0455f4ba307b0cb3dab3712856686232a50f79ae29a9aac2ee5
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical link to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains text that suggests a lure, specifically referencing an 'explorers guide' and including the malicious URL. This indicates the PDF is designed to redirect 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.com/pify?keyword=ff+explorers+guide
    • http://povazul.ggsdesigns.net/uploads/1/3/1/0/131070197/464d6b545b02a1b.pdf
    • http://zotumed.artslcc.com/uploads/1/3/1/8/131856158/karalazovabozaw.pdf
    • http://goloduza.brockdvickers.com/uploads/1/3/1/4/131483492/tevulexa_vifojelaz_vedabididut.pdf
    • https://cdn.shopify.com/s/files/1/0436/4392/8726/files/dadikozipezu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5000/0796/files/siwapogipi.pdf
    • https://cdn.shopify.com/s/files/1/0428/8105/6935/files/tumetutet.pdf
    • https://cdn.shopify.com/s/files/1/0431/6699/0498/files/zojat.pdf
    • https://cdn.shopify.com/s/files/1/0428/9075/6259/files/jozefupefu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4387/2153/files/cushman_and_wakefield_local_market_reports.pdf
    • https://cdn.shopify.com/s/files/1/0435/9972/4702/files/business_standard_english_epaper_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/5752/1574/files/alejandro_magno_conquistador_del_mundo_robin_lane_fox.pdf
    • https://cdn.shopify.com/s/files/1/0435/3189/4944/files/paboridafosavofadaji.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000754e.bin
4fc787a0b5fb72701bfc1bc8731c9b4abed51352a46ed8fb26963c6a6ff0abe9
pdf-font-stream PDF embedded font (sfnt) at offset 0x754E 5024 bytes
font_01_sfnt_off00008684.bin
939a6c4221fa3a0e5a05c30a60991e9003234d7e8feac96572f715c86257c533
pdf-font-stream PDF embedded font (sfnt) at offset 0x8684 10100 bytes