Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4cefb60534adc0a…

MALICIOUS

PDF

40.0 KB Created: 2020-08-12 14:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b28fc2ce815632543535eec8e8fc8aee SHA-1: c149e1c5adb231329c25bc1ae9d9a5c8060e9b51 SHA-256: b4cefb60534adc0a33bb12f2b9cbb07a5125996728168a73adf30f083b6026b7
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, many of which point to a link farm hosted on cdn.shopify.com. One critical heuristic firing indicates a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=abeka+arithmetic+3+pdf'. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous links, including a malicious redirector, suggests a phishing or malware distribution attempt.

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=abeka+arithmetic+3+pdf
    • http://files.krislibrary.com/uploads/1/3/0/7/130740442/1fda0f35313.pdf
    • http://files.senkohrs.com/uploads/1/3/0/9/130969657/1737241.pdf
    • http://files.birthbabiesbeyond.com/uploads/1/3/0/7/130739949/fcfc17e.pdf
    • http://files.freedomdolphindiving.com/uploads/1/3/1/0/131071067/1443019.pdf
    • https://cdn.shopify.com/s/files/1/0432/1188/2653/files/ziteloxevabixi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8172/files/fisanisujobagegenuboz.pdf
    • https://cdn.shopify.com/s/files/1/0436/0211/6772/files/wulijoduwunogot.pdf
    • https://cdn.shopify.com/s/files/1/0433/7369/1045/files/convertidor_catalitico.pdf
    • https://cdn.shopify.com/s/files/1/0440/2823/1830/files/application_letter_for_teaching_position.pdf
    • https://cdn.shopify.com/s/files/1/0435/4641/1160/files/how_to_convert_file_to_word_on_macbook_pro.pdf
    • https://cdn.shopify.com/s/files/1/0435/9146/7176/files/21963672222.pdf
    • https://cdn.shopify.com/s/files/1/0437/6435/1130/files/55394374264.pdf
    • https://cdn.shopify.com/s/files/1/0428/2017/3983/files/the_essential_keto_cookbook_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/8595/4198/files/xupaxaxisobuvolosi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6667/0745/files/nujinudiporidodupikit.pdf
    • https://cdn.shopify.com/s/files/1/0437/5651/9576/files/77580286718.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/komenuj.pdf
    • https://cdn.shopify.com/s/files/1/0439/1796/7528/files/android_bluetooth_spp_example.pdf
    • https://cdn.shopify.com/s/files/1/0432/3203/4980/files/9193326417.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/
    • https://cdn.shopify.com/s/files/1/0437/6435/1130/files/55

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d90.bin
23b66810c6a6e3e8730cd4d11d2dc79b4043a0280682207ac57e1078c1faa81a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D90 5540 bytes
font_01_sfnt_off0000703e.bin
bb07ba03a0169311fde7eef9e36562429d238afc28d1f56e15fcdf7ad7821413
pdf-font-stream PDF embedded font (sfnt) at offset 0x703E 10216 bytes