Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed7dd172cf190b1f…

MALICIOUS

PDF

40.8 KB Created: 2020-08-09 20:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbe9320ff12c9ba11fe23ff0f36b3b77 SHA-1: e2dddeeaf091b7b8dde74d91f3608db9e5d53066 SHA-256: ed7dd172cf190b1f2ae8fa311ece291938d3edd5a29d23a8a6ded5657c9184c8
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure related to 'smoke detector using arduino pdf'. This indicates an attempt to redirect the user to malicious content, likely for phishing or malware distribution. The ML classifier strongly flagged this PDF as malicious.

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=smoke+detector+using+arduino+pdf
    • http://files.thepeckperspective.com/uploads/1/3/1/8/131871963/vurefesosa-tatamefe-subarugevulise.pdf
    • http://files.leolinbowen.com/uploads/1/3/0/7/130776452/mubejoxesevasewa.pdf
    • http://xodupo.turkanaempowermentproject.org/uploads/1/3/1/6/131606289/b6b60a.pdf
    • https://cdn.shopify.com/s/files/1/0434/2117/1879/files/82346409944.pdf
    • https://cdn.shopify.com/s/files/1/0431/6214/0840/files/pakolifivag.pdf
    • https://cdn.shopify.com/s/files/1/0428/3239/6447/files/4320774374.pdf
    • https://cdn.shopify.com/s/files/1/0436/8079/2729/files/mevomojesidixarek.pdf
    • https://cdn.shopify.com/s/files/1/0430/5911/8229/files/46319709150.pdf
    • https://cdn.shopify.com/s/files/1/0429/6792/4899/files/81370946397.pdf
    • https://cdn.shopify.com/s/files/1/0434/4417/5013/files/optimization_algorithms_in_machine_learning.pdf
    • https://cdn.shopify.com/s/files/1/0430/8051/5738/files/56318664344.pdf
    • https://cdn.shopify.com/s/files/1/0429/6012/6118/files/55181489179.pdf
    • https://cdn.shopify.com/s/files/1/0438/3899/6642/files/gujenigubafokaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/head_to_toe_assessment_example.pdf
    • https://cdn.shopify.com/s/files/1/0450/1661/3014/files/understanding_viruses_3rd_edition_free.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_off00006095.bin
28529d0d7b0b42d5954b17ba710419a3dfd078384ac4f3fa4265320be9d6ec04
pdf-font-stream PDF embedded font (sfnt) at offset 0x6095 5612 bytes
font_01_sfnt_off0000739c.bin
5d13ab2fc7cb00f355ff0a7c6845ec6bfcd28d74434ad4cf9dc98f511466d91e
pdf-font-stream PDF embedded font (sfnt) at offset 0x739C 10168 bytes