Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5fc2fb5507cb5a4…

MALICIOUS

PDF

41.8 KB Created: 2020-08-06 22:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b67f89f6be34f3c8baec0d54c239b145 SHA-1: 5c412c6051b04e7d02e33b1d11e41496a16bf726 SHA-256: c5fc2fb5507cb5a4d689fac6deef661fdede57ed9de1c9c0ce85d05b5d128593
150 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 of which point to external resources, a technique often used for SEO poisoning or to redirect users to malicious sites. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=berlin+public+transportation+map+pdf'. The document body, though heavily obfuscated, contains this URL and other Shopify-hosted PDF links, suggesting a lure to a malicious site disguised as a benign document.

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=berlin+public+transportation+map+pdf
    • http://files.harmonizeyourspace.com/uploads/1/3/2/3/132302913/6922088.pdf
    • http://files.cnchomecrafts.net/uploads/1/3/1/3/131398401/9414673.pdf
    • http://files.regionfiveadulted.com/uploads/1/3/0/9/130969659/ripenurigixoganan.pdf
    • https://cdn.shopify.com/s/files/1/0432/9078/7996/files/55999313322.pdf
    • https://cdn.shopify.com/s/files/1/0431/8055/6452/files/fizegesumadafujevar.pdf
    • https://cdn.shopify.com/s/files/1/0432/1994/3579/files/bokuvagoxakugevowewimuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/7526/3898/files/nizejemivisodebizutipabo.pdf
    • https://cdn.shopify.com/s/files/1/0435/5512/7459/files/90971005061.pdf
    • https://cdn.shopify.com/s/files/1/0432/1175/1579/files/mepegivexu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4950/0328/files/fexifikusujegekoxubodil.pdf
    • https://cdn.shopify.com/s/files/1/0428/6775/3116/files/xomifetoxuwosezun.pdf
    • https://cdn.shopify.com/s/files/1/0434/5616/8093/files/9668277228.pdf
    • https://cdn.shopify.com/s/files/1/0434/6822/6725/files/rumenozufefojevuniwelib.pdf
    • https://cdn.shopify.com/s/files/1/0430/9080/4893/files/3125365047.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_off00006591.bin
25db6b61bb0872f232cc7f3e5e11c7970ccb07e7fe4f618a250633618aab1e15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6591 5492 bytes
font_01_sfnt_off0000781f.bin
c74c8758fbbe730e698dc91371ea717c89bb52055a80a333d48f3617dca63028		 pdf-font-stream PDF embedded font (sfnt) at offset 0x781F 10112 bytes

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