Malicious PDF — malware analysis report

Static analysis result for SHA-256 adc8665d98133626…

MALICIOUS

PDF

47.2 KB Created: 2020-08-24 22:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4bf5ef03106889ffa9e213fd52a2a35 SHA-1: a14e36ab8443e009b0355eaae5d7ad7baecf1863 SHA-256: adc8665d9813362670c0dc874ffa18a152f4c526b8392eb360c202c6d2121109
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF contains a significant number of embedded links, identified as a link farm. The primary malicious URL, 'https://ttraff.ru/pify?keyword=google+chromium+os++iso', is a known redirector. This suggests the document's purpose is to lure users through a chain of redirects to a malicious destination. No scripts were extracted, and the document body was heavily obfuscated, but the link farm heuristic and the malicious redirector link are strong indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=google+chromium+os++iso
    • http://files.sungsulim.com/uploads/1/3/2/6/132683080/4244463.pdf
    • http://files.en.guacamaya.info/uploads/1/3/1/3/131383657/vulexufenolibu.pdf
    • https://cdn.shopify.com/s/files/1/0435/9864/3363/files/povonomidebap.pdf
    • https://cdn.shopify.com/s/files/1/0432/3888/3485/files/85376120332.pdf
    • https://cdn.shopify.com/s/files/1/0433/5930/5880/files/10000_days_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0464/1344/7336/files/40328298020.pdf
    • https://cdn.shopify.com/s/files/1/0428/8937/9993/files/write_in_logarithmic_form.pdf
    • https://cdn.shopify.com/s/files/1/0429/4030/1478/files/dnd_5e_genasi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7176/6690/files/1743020417.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/libutufisolefod.pdf
    • https://cdn.shopify.com/s/files/1/0430/8644/6746/files/disarufofenakime.pdf
    • https://cdn.shopify.com/s/files/1/0433/1218/5502/files/veterinary_microbiology_and_microbial_disease.pdf
    • https://cdn.shopify.com/s/files/1/0431/9654/7230/files/12040006239.pdf
    • https://cdn.shopify.com/s/files/1/0432/5218/7298/files/nitrogen_cycle_file.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f7f.bin
5a4cb9c1674d3145e5bb4f03dd8458214fa69252e7ffbacc1275d8f7cb4bd3dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F7F 4732 bytes
font_01_sfnt_off00007f91.bin
a605fdee338131e8e08e616a5abccff5ab525f0df788b409c19a1057b6a6cd73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F91 9944 bytes
font_02_sfnt_off0000a19a.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA19A 4324 bytes

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