Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a4eeb24f87a8069…

MALICIOUS

PDF

48.0 KB Created: 2020-08-04 12:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ee44105c137086b0872fbb87c5a6180 SHA-1: c0def71783b08acdb45ce3925c9b4271cc6651d0 SHA-256: 7a4eeb24f87a8069b08b45e337fa9cf92553f06a327c6cb8f7da80d808c8d4e1
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 pointing to Shopify domains, which is characteristic of SEO poisoning or link farm tactics. One critical heuristic identified a link to a known malicious redirector at `https://ttraff.com/pify?keyword=l%25C6%25B0u+file+pdf+kh%25C3%25B4ng+ch%25E1%25BB%2589nh+s%25E1%25BB%25ADa+%25C4%2591%25C6%25B0%25E1%25BB%25A3c`. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated.

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.com/pify?keyword=l%25C6%25B0u+file+pdf+kh%25C3%25B4ng+ch%25E1%25BB%2589nh+s%25E1%25BB%25ADa+%25C4%2591%25C6%25B0%25E1%25BB%25A3c
    • http://files.lexmobilepetgroomer.com/uploads/1/3/2/7/132712006/lamimowor_gosonepazi.pdf
    • http://files.vapath.org/uploads/1/3/1/4/131409709/6197041.pdf
    • http://files.thedialoguezone.com/uploads/1/3/1/4/131453048/vutoxewux.pdf
    • http://files.fairdare.org/uploads/1/3/0/7/130776644/c311eceb3ef6.pdf
    • http://files.dentistrathmines.com/uploads/1/3/2/6/132683154/jirojoxovugapakokoj.pdf
    • https://cdn.shopify.com/s/files/1/0427/5778/3718/files/woxesudebivazowazedafu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0563/9836/files/92283012770.pdf
    • https://cdn.shopify.com/s/files/1/0428/0002/1667/files/vezirixuxek.pdf
    • https://cdn.shopify.com/s/files/1/0436/9930/6650/files/leadership_and_teamwork.pdf
    • https://cdn.shopify.com/s/files/1/0431/9569/5266/files/bemukozenarejap.pdf
    • https://cdn.shopify.com/s/files/1/0431/0482/9589/files/4832354737.pdf
    • https://cdn.shopify.com/s/files/1/0436/5362/8062/files/softball_evaluation_form.pdf
    • https://cdn.shopify.com/s/files/1/0432/8259/6004/files/bedipopuwofarafoweba.pdf
    • https://cdn.shopify.com/s/files/1/0433/1179/2286/files/13857073149.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7325/files/zarelaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/7251/1386/files/geniwotaweso.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
font_00_sfnt_off000059ba.bin
353cb5b0a6cfda9f99e53c2fdd0da3d0abd888f250a29de7818912d8053b472b
pdf-font-stream PDF embedded font (sfnt) at offset 0x59BA 6196 bytes
font_01_sfnt_off00006de3.bin
70bfaa0b406b30661f07120117e4cc17eaf04c713dcb5c4e5cb201dde3b0bcb8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE3 20700 bytes
font_02_sfnt_off00009ad5.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15
pdf-font-stream PDF embedded font (sfnt) at offset 0x9AD5 16204 bytes