Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd7251a2c86eab1…

MALICIOUS

PDF

44.5 KB Created: 2020-08-17 13:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73e683db71bf7c4091f9c22e31ab9e35 SHA-1: a4c04a76dede41c59ad5b2601622f0a1c431f83c SHA-256: cfd7251a2c86eab15519d65f4177fe997bafb3006c6b78878cbc292a23a95dc5
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files hosted on various domains, indicating a link farm. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=linen+bed+sheets+king'. The document body, though heavily obfuscated, also contains this URL and other PDF links. This suggests the primary goal is to redirect the user to malicious infrastructure, likely for phishing or malware distribution.

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=linen+bed+sheets+king
    • http://sukala.hooberproduce.com/uploads/1/3/1/3/131380213/5154705.pdf
    • http://files.garygintherstudios.com/uploads/1/3/1/4/131453393/jefabinusi_bedobamedi.pdf
    • http://gorezurek.re33.net/uploads/1/3/0/8/130814761/nujavowafikegak_wifolojenik.pdf
    • http://gonar.unitedchesed.com/uploads/1/3/2/6/132681342/5757975.pdf
    • http://files.actcdc.org.au/uploads/1/3/0/7/130775309/zobikagoler.pdf
    • https://cdn.shopify.com/s/files/1/0434/7274/8710/files/after_20_years_questions.pdf
    • https://cdn.shopify.com/s/files/1/0430/7910/6724/files/40946590573.pdf
    • https://cdn.shopify.com/s/files/1/0434/5213/7622/files/pabatonip.pdf
    • https://cdn.shopify.com/s/files/1/0433/5622/5688/files/nivagis.pdf
    • https://cdn.shopify.com/s/files/1/0434/1828/8277/files/92625148612.pdf
    • https://cdn.shopify.com/s/files/1/0436/4953/2069/files/sakod.pdf
    • https://cdn.shopify.com/s/files/1/0434/7346/9597/files/reloading_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/7532/1499/files/30272487667.pdf
    • https://cdn.shopify.com/s/files/1/0433/9567/8359/files/24002847093.pdf
    • https://cdn.shopify.com/s/files/1/0437/9534/9666/files/git_permission_denied_publickey.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_off00007051.bin
717149a02a80340897e54ddc50f7c77235f806f7ac1e7f485edf9c8e65211e9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7051 4896 bytes
font_01_sfnt_off000080f4.bin
e863c97e7dcf326bb666196788f7b131ca675373e2fe062f18cc73f9ee1bea04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80F4 10772 bytes

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