Malicious PDF — malware analysis report

Static analysis result for SHA-256 81200c5e6c15efc9…

MALICIOUS

PDF

42.6 KB Created: 2020-08-25 06:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20a45371a440f5394297217e40cdf452 SHA-1: ed19487049d782e28267f5b46ea2058f394fa207 SHA-256: 81200c5e6c15efc9af0c5b96f980615224c70138703e6412ddb161361391efb8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, many of which point to a redirector service known for malicious activity. The primary malicious URL identified is ttraff.ru, which is used to redirect users to other sites, likely for further exploitation or phishing. The document body, though heavily obfuscated, contains references to the malicious URL and other benign-looking PDF links, suggesting a link farm lure.

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.ru/pify?keyword=bluestacks+android+emulator+version+3
    • http://files.beaconbeerco.com/uploads/1/3/1/4/131453124/duvepufat-retefupemefu-dezufa-bowipusiliri.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5042/5750/files/56369912020.pdf
    • https://cdn.shopify.com/s/files/1/0430/4253/7629/files/26876935140.pdf
    • https://cdn.shopify.com/s/files/1/0431/1272/6677/files/architectural_digest_magazine.pdf
    • https://cdn.shopify.com/s/files/1/0439/2294/8251/files/61465264672.pdf
    • https://cdn.shopify.com/s/files/1/0431/0437/0842/files/36376576622.pdf
    • https://cdn.shopify.com/s/files/1/0429/5317/9289/files/webijesupapuwukipakogilek.pdf
    • https://cdn.shopify.com/s/files/1/0432/7548/5339/files/aprender_a_dibujar_rostros_paso_a_paso.pdf
    • https://cdn.shopify.com/s/files/1/0433/4606/7621/files/11279966016.pdf
    • https://cdn.shopify.com/s/files/1/0427/4146/5244/files/don_t_be_a_menace_free_movie.pdf
    • https://cdn.shopify.com/s/files/1/0428/6211/7031/files/92253513543.pdf
    • https://cdn.shopify.com/s/files/1/0432/8449/6550/files/bonasij.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069da.bin
94c3966520732db4e31805f0d9b15e282978aef34889ccc79cd46315e294d6ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x69DA 5424 bytes
font_01_sfnt_off00007c30.bin
a65df4ce3714bbe995239175d3e0885ef7b750aa0e75a480145a69e820e12ceb
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C30 9868 bytes