Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb559afd1e4d2d99…

MALICIOUS

PDF

58.8 KB Created: 2020-08-18 17:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f56a8e4d5a94d2a4f918754d820ce73f SHA-1: f30152b8d05e12e5ad8e59384b98c5f45888d0d2 SHA-256: eb559afd1e4d2d99f97f686bbc758a805f089a184ca92a199c3ac6da6a65cda5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a malicious redirector link disguised as a notification about an Android version update. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic shows a large number of outbound links, many hosted on Shopify, likely for SEO poisoning or link farming. The primary malicious URL is https://ttraff.cc/pify?keyword=android+version+9+galaxy+s7, which redirects to a PDF hosted on Shopify. This suggests a phishing or scam campaign aiming to trick users into downloading further malicious 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.cc/pify?keyword=android+version+9+galaxy+s7
    • http://files.bistroelan.com/uploads/1/3/1/4/131437029/1758884.pdf
    • http://files.lomondlogs.co.uk/uploads/1/3/1/3/131383318/lasuk.pdf
    • http://files.sethharrislaw.com/uploads/1/3/2/7/132712185/nalerufupej.pdf
    • https://cdn.shopify.com/s/files/1/0432/5559/5172/files/23394950229.pdf
    • https://cdn.shopify.com/s/files/1/0436/0683/5358/files/kimefobibaf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/68905528383.pdf
    • https://cdn.shopify.com/s/files/1/0434/8503/6708/files/bevisijubebexanavuxi.pdf
    • https://cdn.shopify.com/s/files/1/0429/3191/2857/files/mikumimibu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6249/3345/files/deism_vs_theism.pdf
    • https://cdn.shopify.com/s/files/1/0433/2371/9845/files/brihaspativar_katha.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/91300886864.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_off00009ef4.bin
ea183121e230bcee7008584de64d4d0eeae9f3065a86972ab26e9c648bb2b649
pdf-font-stream PDF embedded font (sfnt) at offset 0x9EF4 5448 bytes
font_01_sfnt_off0000b196.bin
ff97ed9a37e29e6fd07bee08a94bd39ab1d22a92157eea736832ff3f1255d005
pdf-font-stream PDF embedded font (sfnt) at offset 0xB196 14064 bytes