Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ec51390f8aa81c…

MALICIOUS

PDF

49.3 KB Created: 2020-08-12 05:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eacb24333faf7433258bb0e8dc6e9759 SHA-1: 5ef7bb31cbf09149ac5f25261b4d659f60a6ac0a SHA-256: 42ec51390f8aa81c3813b3e61d557d082ef931ea427ee693a683bbda14dee487
154 Risk Score

Malware Insights

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

The PDF document uses a lure of 'gazebo plans free pdf' to entice users. It contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/wb?keyword=gazebo%20plans%20free%20pdf'. Additionally, it exhibits a PDF SEO link farm behavior, embedding numerous links, with the first identified as 'https://cdn.shopify.com/s/files/1/0427/6640/1692/files/sasodevimaxiro.pdf'. The ML classifier also strongly indicated maliciousness. The combination of a malicious redirector and a link farm suggests an attempt to either distribute malware or phish for information by obscuring the final destination.

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=gazebo%20plans%20free%20pdf
    • http://files.islandphysics.com/uploads/1/3/1/6/131636655/xeripu.pdf
    • http://files.arcguam.com/uploads/1/3/1/1/131163563/beditoxuxob_lawade_kupujotoribi_gavet.pdf
    • http://kenude.companyh26th.com/uploads/1/3/2/7/132740978/554118.pdf
    • http://jopor.buildingakingdomcompany.com/uploads/1/3/0/7/130775918/wazagoba.pdf
    • https://cdn.shopify.com/s/files/1/0427/6640/1692/files/sasodevimaxiro.pdf
    • https://cdn.shopify.com/s/files/1/0434/6055/9013/files/tutosedaturijeluvoboxaf.pdf
    • https://cdn.shopify.com/s/files/1/0427/6856/4380/files/buwimolazolavanokunowed.pdf
    • https://cdn.shopify.com/s/files/1/0440/0244/3422/files/3357073936.pdf
    • https://cdn.shopify.com/s/files/1/0432/5064/7204/files/99994724678.pdf
    • https://cdn.shopify.com/s/files/1/0437/0785/9096/files/time_after_time_lyrics_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0431/7852/4831/files/95816690617.pdf
    • https://cdn.shopify.com/s/files/1/0436/1627/2547/files/vevikijizalumejolixoso.pdf
    • https://cdn.shopify.com/s/files/1/0433/6130/4728/files/56813601826.pdf
    • https://cdn.shopify.com/s/files/1/0431/9097/6673/files/55166495955.pdf
    • https://cdn.shopify.com/s/files/1/0438/1153/7053/files/gewonud.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_off00008333.bin
a22fa962b7fe1982240dd2c38764da9953d6a574325280f598f40ebe712ded40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8333 5256 bytes
font_01_sfnt_off00009526.bin
2ae496baa24c2a91f3a61e3e3ad0a2366ae641ef4effbbcabf36943c5d93e637		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9526 10320 bytes

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