Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1e4973de1cf9580…

MALICIOUS

PDF

41.8 KB Created: 2020-08-15 09:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8138dbaac18df899407ac9d78cc5cc9 SHA-1: b49ef9258a865b74cf5f3cbaf956f1ce04dbf6bd SHA-256: d1e4973de1cf9580711c86ca13cb7be1d3ebc9fda00fca37b2bd4e476e1016e7
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many hosted on cdn.shopify.com, designed to appear as educational resources. One prominent link, 'https://ttraff.cc/wb?keyword=comparing%20fractions%20on%20a%20number%20line%20worksheets', is identified as a known malicious redirector. This suggests the document's primary purpose is to lure users to malicious infrastructure by masquerading as legitimate content.

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/wb?keyword=comparing%20fractions%20on%20a%20number%20line%20worksheets
    • http://files.fairyboatscrubbers.com/uploads/1/3/1/4/131453897/9fda274df32d661.pdf
    • https://cdn.shopify.com/s/files/1/0432/7450/2312/files/dufabuwex.pdf
    • https://cdn.shopify.com/s/files/1/0428/3649/2444/files/82875572969.pdf
    • https://cdn.shopify.com/s/files/1/0432/9252/4700/files/world_all_important_days.pdf
    • https://cdn.shopify.com/s/files/1/0428/8151/5673/files/ninomeziwikodedatud.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53635556436.pdf
    • https://cdn.shopify.com/s/files/1/0432/9085/3540/files/dogosumamoxafi.pdf
    • https://cdn.shopify.com/s/files/1/0433/7994/9718/files/87433873132.pdf
    • https://cdn.shopify.com/s/files/1/0432/2764/4072/files/19360892437.pdf
    • https://cdn.shopify.com/s/files/1/0432/8102/3132/files/galidafonujulivodedod.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_off00005723.bin
865917247e29b7ca367801e2853ee17a2406f9ee2fd7ca26ae50dd12985e79e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x5723 5632 bytes
font_01_sfnt_off00006a2e.bin
01dca0dc3bc68528c2a26374e36b240bd6857d584d898dec1a40e8094c316ab2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A2E 9988 bytes
font_02_sfnt_off00008c49.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C49 4324 bytes