Malicious PDF — malware analysis report

Static analysis result for SHA-256 8be8ef047b31675f…

MALICIOUS

PDF

37.0 KB Created: 2020-08-22 14:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2905e698e4c1207a7fa4d8d8344b9d4f SHA-1: 0d56c499237f39781c3f223ddaf6874ac2b28766 SHA-256: 8be8ef047b31675fe3948c3d45d12d255505604025af5748aa6067c847335f4b
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external links, suggesting a link farm or phishing lure. The presence of a link to 'ttraff.ru', identified as a known malicious redirector, strongly indicates a malicious intent. While many other links point to benign Shopify URLs, the inclusion of the malicious redirector is the primary indicator of compromise. The document body contains garbled text and URLs, further supporting the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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=3d+audio+songs++djmaza
    • http://files.delsocialmedia.com/uploads/1/3/1/0/131070151/4747031.pdf
    • https://cdn.shopify.com/s/files/1/0438/8998/3643/files/diatonic_arpeggios.pdf
    • https://cdn.shopify.com/s/files/1/0431/3962/9218/files/disejipo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8576/6561/files/66240520291.pdf
    • https://cdn.shopify.com/s/files/1/0450/3486/4798/files/skyrim_rudy_enb.pdf
    • https://cdn.shopify.com/s/files/1/0437/4829/4807/files/telukotodipa.pdf
    • https://cdn.shopify.com/s/files/1/0448/0742/2109/files/listview_using_baseadapter_in_android.pdf
    • https://cdn.shopify.com/s/files/1/0433/9017/3333/files/scientific_notation_guided_notes_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0432/6896/4505/files/24838281432.pdf
    • https://cdn.shopify.com/s/files/1/0431/5280/1943/files/eeg_report.pdf
    • https://cdn.shopify.com/s/files/1/0440/6139/3046/files/tabuve.pdf
    • https://cdn.shopify.com/s/files/1/0433/2063/9646/files/53745821752.pdf
    • https://cdn.shopify.com/s/files/1/0432/9072/2469/files/35835967405.pdf
    • https://cdn.shopify.com/s/files/1/0443/9402/1030/files/tanina.pdf
    • https://cdn.shopify.com/s/files/1/0428/0041/4883/files/rukaxovafubudowu.pdf

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005240.bin
3071bce57ded5032993918addbdf7ed69f083477b6106d65c878547c544c72ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5240 5212 bytes
font_01_sfnt_off000063eb.bin
784475659584083432cf4324dfd4623d3756c51b8e50b83f1d26207df1a91e00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63EB 14260 bytes

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