Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2ebc34e80483a0e…

MALICIOUS

PDF

36.2 KB Created: 2020-08-21 03:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8938a5f17949bd1af71d8f6a156b2ed SHA-1: 70ddf6f867dbd944860a7215dfadd16788d7f29b SHA-256: b2ebc34e80483a0e03585484e29a22ba69e4bc0057275d21c88fdb1c3e5a571b
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a worksheet, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged this PDF with high confidence. The document body, though partially corrupted, contains text related to 'dividing whole numbers by mixed fractions worksheet' and the malicious URL, reinforcing the lure. The primary malicious IOC is the ttraff.ru redirector, which likely leads to further malicious content.

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=dividing+whole+numbers+by+mixed+fractions+worksheet
    • http://zavopu.pahasapagrotto.org/uploads/1/3/1/6/131636725/50491.pdf
    • https://cdn.shopify.com/s/files/1/0428/5097/5910/files/reference_letter_template_doc.pdf
    • https://cdn.shopify.com/s/files/1/0432/4248/7963/files/94830362127.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/farafijawajozirasokofo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5440/7578/files/rodalies_renfe_r4.pdf
    • https://cdn.shopify.com/s/files/1/0431/4628/1121/files/98836036364.pdf
    • https://cdn.shopify.com/s/files/1/0429/8702/8641/files/62006586906.pdf
    • https://cdn.shopify.com/s/files/1/0431/8593/0389/files/netflix_mod_apk_revdl.pdf
    • https://cdn.shopify.com/s/files/1/0429/1274/3591/files/65077866286.pdf
    • https://cdn.shopify.com/s/files/1/0437/0687/6055/files/video_online_cho_iphone.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/vikokojitekexubira.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_off00004e2f.bin
1f37c39805e572087433caebea4fad40337bcbc91c9361723472c9f01a669735		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E2F 5960 bytes
font_01_sfnt_off00006267.bin
050f7bc0ec470e15ee78795cb628152eafff175e4d1218b49e094c5d953a9c29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6267 9880 bytes

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