Malicious PDF — malware analysis report

Static analysis result for SHA-256 b661d604f7dd570b…

MALICIOUS

PDF

50.9 KB Created: 2020-08-19 18:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac871871fb3cf449482a66792b38f22f SHA-1: 246512dc097b66020e95d4b16492b0948e777fc4 SHA-256: b661d604f7dd570bc74ca01039051b0a6a93cb8103a497d9338a334b9f12b860
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.cc' with a keyword suggesting a lure for app downloads. Additionally, a PDF SEO link farm heuristic indicates the document is designed to host numerous external links, many of which are hosted on Shopify. The document body contains the same malicious URL and a list of other URLs, likely part of the link farm. The primary intent appears to be redirecting users to malicious infrastructure under the guise of providing access to 'appvalley android online'.

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.cc/pify?keyword=appvalley+android+online
    • http://pazibawup.bagsbytheshore.com/uploads/1/3/0/7/130739654/1528984.pdf
    • http://files.heatherchrisler.com/uploads/1/3/1/4/131438073/patogidamivog_vuxuzojawabapel.pdf
    • http://kexome.writerchrissimpson.com/uploads/1/3/0/8/130813765/gedatifimofifa_dipewoxed.pdf
    • https://cdn.shopify.com/s/files/1/0432/5795/4464/files/43514806783.pdf
    • https://cdn.shopify.com/s/files/1/0432/6283/6891/files/pollination_in_plants_video.pdf
    • https://cdn.shopify.com/s/files/1/0434/0334/6078/files/self_certification_form_nhs.pdf
    • https://cdn.shopify.com/s/files/1/0433/6461/4303/files/42847179720.pdf
    • https://cdn.shopify.com/s/files/1/0428/6165/8279/files/veviwupurazavo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3886/6593/files/tapugisa.pdf
    • https://cdn.shopify.com/s/files/1/0433/7526/3909/files/89745148475.pdf
    • https://cdn.shopify.com/s/files/1/0430/9634/2695/files/27106357753.pdf
    • https://cdn.shopify.com/s/files/1/0435/0767/9387/files/detakof.pdf
    • https://cdn.shopify.com/s/files/1/0437/0310/7752/files/rewuxivarejagexikenofavow.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000a52e.bin
350959d01400f5bad8bc0d16b2757c536353b7c6dbececaa902d42cb8c41693d
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA52E 17380 bytes
font_00_sfnt_off00006f23.bin
c5f70fbae4f976f6eeb143aac6fcd5b2a618c8095d623e6bb0651b4439c2083c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F23 4924 bytes
font_01_sfnt_off00007ff9.bin
e77017022b9f9ac25359cbb90dc497a1e564c4610b71c2eb2cdf160dbb11d2c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FF9 10844 bytes