Malicious PDF — malware analysis report

Static analysis result for SHA-256 d18fa043624bf47c…

MALICIOUS

PDF

47.7 KB Created: 2020-08-08 07:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99abc021f2c1b411d1f142648eb66bb8 SHA-1: 3764231ae87b736e8d6d17874a580c6537d41a87 SHA-256: d18fa043624bf47c82802c97ac5a2b77c69484dff72faf49ef82ce9af163b49d
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link and a PDF link farm. The embedded URL points to a redirector that uses a book title as a lure, suggesting a phishing or scam attempt. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of malicious links is sufficient to determine the attack pattern.

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=the+knight+s+tale+by+geoffrey+chaucer+pdf
    • http://files.catherinehedrich.com/uploads/1/3/0/7/130775304/9562005.pdf
    • http://files.elrinteriors.com/uploads/1/3/1/4/131453817/dumulemibiw_xefatijimumugij_jamiladatetexo_rorafure.pdf
    • http://files.abivaonlineresources.com/uploads/1/3/2/7/132712508/gekizugomazosuw.pdf
    • https://cdn.shopify.co
    • https://cdn.shopify.com/s/files/1/0437/0500/8293/files/bazes.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lozafawofife.pdf
    • https://cdn.shopify.com/s/files/1/0431/4519/9784/files/liwotumepotom.pdf
    • https://cdn.shopify.com/s/files/1/0430/0292/1111/files/60762505037.pdf
    • https://cdn.shopify.com/s/files/1/0434/6265/6152/files/json_file_comment.pdf
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/jopozox.pdf
    • https://cdn.shopify.com/s/files/1/0433/9580/9431/files/victorville_weather_forecast.pdf
    • https://cdn.shopify.com/s/files/1/0429/0890/9734/files/47678177140.pdf
    • https://cdn.shopify.com/s/files/1/0432/4445/4056/files/budod.pdf
    • https://cdn.shopify.com/s/files/1/0431/6617/1297/files/40620382100.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_off00007ad0.bin
442129228bec6ea1ee4b2a4754f9dc69f679c021af8e5577d4a99b5706f2e997		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AD0 5672 bytes
font_01_sfnt_off00008e1b.bin
269993d0b1fc729beb48ba2ece2e94c380a1dff3b76e750efb602f6b4920272a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E1B 10504 bytes

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