Malicious PDF — malware analysis report

Static analysis result for SHA-256 96d8da6859ecf725…

MALICIOUS

PDF

41.9 KB Created: 2020-08-23 12:28:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35a230450a944118541be15769475f91 SHA-1: 615faf5dc78b418082fc20b55a324d6ee0c934cb SHA-256: 96d8da6859ecf725c9639fc83655d22e88536cc73903dd7df12b3592a5437dcf
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as spelling worksheets. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the malicious URL and several other URLs hosted on Shopify and other domains, suggesting a link farm or redirection strategy. No scripts were extracted, but the presence of a malicious redirector and the ML classification point to a phishing or redirection attack.

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.com/pify?keyword=spelling+worksheets+for+middle+schooler
    • http://fomej.gypsymagicoracle.com/uploads/1/3/0/8/130873995/b9e54.pdf
    • http://xadeve.donkeytalkshop.com/uploads/1/3/1/6/131606490/b1d8c.pdf
    • https://cdn.shopify.com/s/files/1/0433/7192/1571/files/pefodaxuz.pdf
    • https://cdn.shopify.com/s/files/1/0433/4521/5637/files/73750630590.pdf
    • https://cdn.shopify.com/s/files/1/0432/4176/7072/files/gupodoxulitakekuwukesojop.pdf
    • https://cdn.shopify.com/s/files/1/0432/6352/5026/files/4937071425.pdf
    • https://cdn.shopify.com/s/files/1/0430/5970/8058/files/vitodarusizilufofejujika.pdf
    • https://cdn.shopify.com/s/files/1/0432/7361/7576/files/95914170639.pdf
    • https://cdn.shopify.com/s/files/1/0436/1378/2173/files/verbal_reasoning_test_practice_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/0255/2742/files/rajagekodidekojalifepefak.pdf
    • https://cdn.shopify.com/s/files/1/0437/3656/3866/files/nyc_3l_2015.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_off00006528.bin
53d7af96f7032dd2b7486316874dd8cdddced3aa334b1daf15fad04c0601e3bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x6528 5620 bytes
font_01_sfnt_off0000782b.bin
55b3d015e394ef7eb2f093f7c5e220fca0d6b0113ae3f1e878c48e4590239df4
pdf-font-stream PDF embedded font (sfnt) at offset 0x782B 10088 bytes