Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f95b88f2c727fb…

MALICIOUS

PDF

42.8 KB Created: 2020-08-06 09:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3eb47bba7d8f8b0b87147d64648b14b SHA-1: 027aa6049d3e039622613c4958ceb8bfe6b4bc7b SHA-256: a7f95b88f2c727fbf139b8dfd23f8b14e2395b2405b301b6d7c522b257cc9e0f
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.ru/pify?keyword=ikigai+book+pdf+free+download`. This URL is presented within the document body as a lure for a free PDF download. The PDF also exhibits characteristics of a link farm, with numerous embedded links, many pointing to Shopify domains, likely for SEO manipulation to increase visibility of the malicious redirector. The ML classifier strongly supports the malicious nature of this PDF.

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=ikigai+book+pdf+free+download
    • http://files.purpleinkpublishing.com/uploads/1/3/1/4/131437844/mikofoxaxomojope.pdf
    • http://files.flyawaykate.com/uploads/1/3/0/9/130969607/722231.pdf
    • http://files.uplift.ccsdtitle1.org/uploads/1/3/0/8/130873903/63625ce46bd5f.pdf
    • https://cdn.shopify.com/s/files/1/0432/4596/1383/files/17632197638.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/wafijizaveka.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/wisitepezeredakoru.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/97072231683.pdf
    • https://cdn.shopify.com/s/files/1/0437/6346/6391/files/47101422820.pdf
    • https://cdn.shopify.com/s/files/1/0432/1935/3757/files/kolemobexakorukuje.pdf
    • https://cdn.shopify.com/s/files/1/0435/4818/0634/files/is_touchcopy_safe.pdf
    • https://cdn.shopify.com/s/files/1/0429/4891/9450/files/ion_block_rocker_manual.pdf
    • https://cdn.shopify.com/s/files/1/0427/9762/9596/files/79235469893.pdf
    • https://cdn.shopify.com/s/files/1/0436/3137/8592/files/78408951505.pdf
    • https://cdn.shopify.com/s/files/1/0433/5792/9623/files/telikasorotegelogutegi.pdf
    • https://cdn.shopify.com/s/files/1/0438/9617/6795/files/solikufofaju.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fiwowosilikaragufes.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/mimuzamufanobexeg.pdf
    • https://cdn.shopify.com/s/files/1/0431/4916/4698/files/11123408927.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_off000069e3.bin
d6f0b29f3789c01ffeb30f27548d29d7091850fcaee0a181c945a117678386b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x69E3 5264 bytes
font_01_sfnt_off00007bf3.bin
51296975c3ac239aa408d6fa79c4ae6d8dbb189dbd20f84060cb2aed5ce25241
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BF3 10124 bytes