Malicious PDF — malware analysis report

Static analysis result for SHA-256 a099629229ea49b1…

MALICIOUS

PDF

39.6 KB Created: 2020-08-09 17:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f80344a1a80cf42fadb14bf2fb023630 SHA-1: 0927eea8644ca0681faee7803c10f5289133d2e3 SHA-256: a099629229ea49b15751b3b9f6fb61af7dba01960cbac9cb49f43de4ebaeda00
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one heuristic specifically identifying it as a PDF link farm. The primary redirector URL, https://ttraff.cc/pify?keyword=encyclopedia+brown+cracks+the+case+pdf, is flagged as malicious. The ML classifier also strongly indicated maliciousness. The document body appears to be largely obfuscated or contains minimal readable content, but the presence of numerous links and the malicious redirector strongly suggest a malicious intent, likely to lure users to harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=encyclopedia+brown+cracks+the+case+pdf
    • http://files.ashleyparsonsyoga.com/uploads/1/3/2/7/132740415/newixebomufobezofawe.pdf
    • http://jepawilal.spiritofaustralia2.com/uploads/1/3/0/8/130874058/98a39a3045b.pdf
    • http://files.lwbranding.com/uploads/1/3/1/3/131398591/eaab7410.pdf
    • https://cdn.shopify.com/s/files/1/0434/2792/2076/files/cbse_sample_paper_2020_class_12_accountancy.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/xokagoxenig.pdf
    • https://cdn.shopify.com/s/files/1/0432/9642/4096/files/givexefulotivivov.pdf
    • https://cdn.shopify.com/s/files/1/0438/2582/3904/files/fizawisipamolavuvuvoduzoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0792/5654/files/23933249622.pdf
    • https://cdn.shopify.com/s/files/1/0437/9095/8752/files/palmistry_in_bengali.pdf
    • https://cdn.shopify.com/s/files/1/0431/6125/6096/files/34861864586.pdf
    • https://cdn.shopify.com/s/files/1/0433/0445/2246/files/ruzamukubakaxusugomej.pdf
    • https://cdn.shopify.com/s/files/1/0433/3119/0952/files/66064657760.pdf
    • https://cdn.shopify.com/s/files/1/0433/2571/8678/files/57650836748.pdf
    • https://cdn.shopify.com/s/files/1/0437/9030/3393/files/tobapub.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_off00005d3a.bin
a58461e5d168f4103851c564f13e1ce7904c91dc650261d972421145215890a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D3A 5596 bytes
font_01_sfnt_off00007061.bin
05e7625f1ff08be140cc8506516339826d5348b61608cb667fd0b66e520b1731
pdf-font-stream PDF embedded font (sfnt) at offset 0x7061 9696 bytes