Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e623dd6b900163…

MALICIOUS

PDF

45.3 KB Created: 2020-08-12 14:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f98603f74852581d3b11692fc89f8b04 SHA-1: da0be62b3d836e16a3cce01d1a34c996c43be3d6 SHA-256: a5e623dd6b900163aee58390a70dcb453870b381c36afba4936f9df796f4b8da
140 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, but one critical link directs to a known malicious redirector at ttraff.ru. The document body, though heavily obfuscated, contains text related to 'inclined plane worksheet grade 2' and the malicious URL, suggesting a lure to disguise the malicious intent. The presence of a callback lure heuristic further supports a phishing or scam pretext. No scripts were extracted from this sample.

Heuristics 4

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns
  • 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/wb?keyword=inclined%20plane%20worksheet%20grade%202
    • http://files.mrpielak.com/uploads/1/3/1/4/131453252/laposotegawujasiri.pdf
    • http://files.durbanafrica.co.za/uploads/1/3/0/8/130814043/wowemupezowolu.pdf
    • http://files.canberrabirthservices.com/uploads/1/3/0/8/130813841/0917fed35c1bd.pdf
    • http://bepujefi.hand-e.org/uploads/1/3/0/8/130814058/a2c1a1a0b8859.pdf
    • https://cdn.shopify.com/s/files/1/0440/4445/2005/files/calculus_varberg_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0440/4012/6614/files/26156076146.pdf
    • https://cdn.shopify.com/s/files/1/0437/8660/0609/files/sorul.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nimapudusakodinufuzexive.pdf
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/about_myself_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0427/7354/5116/files/tamesemekalekefeb.pdf
    • https://cdn.shopify.com/s/files/1/0431/4847/6570/files/aviation_and_airport_security_kathleen_sweet.pdf
    • https://cdn.shopify.com/s/files/1/0430/4555/2290/files/gakegapavudigadumobukirem.pdf
    • https://cdn.shopify.com/s/files/1/0432/4383/1464/files/14397095653.pdf
    • https://cdn.shopify.com/s/files/1/0438/7936/6811/files/radakapajoziwebubov.pdf
    • https://cdn.shopify.com/s/files/1/0431/7600/1704/files/arang_tempurung_kelapa.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_off000071c7.bin
c48dd50650eb963dd8f21db81ecdc3bc46c9679f46f63a6c089854fab81eed72
pdf-font-stream PDF embedded font (sfnt) at offset 0x71C7 5560 bytes
font_01_sfnt_off000084b5.bin
9ce65c7c932dddd1415e2533d03b15a0476892320696049c163906a45dc1e35c
pdf-font-stream PDF embedded font (sfnt) at offset 0x84B5 10532 bytes