Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa37fd47b5f52b3…

MALICIOUS

PDF

42.3 KB Created: 2020-08-30 03:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ca6eaca17d06426821acc2ae65dbe45 SHA-1: 7fc21de3cda69fa2f9fbd7c5bdafe195d5af6261 SHA-256: 5aa37fd47b5f52b37aa32ac2267a0a089a5f686560e7d76a8acdb463fc619f5b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/wix?keyword=following+directions+worksheets+for', which is flagged as malicious. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning attempt to distribute malicious 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/wix?keyword=following+directions+worksheets+for
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/6050/9337/files/jolujekibovera.pdf
    • https://cdn.shopify.com/s/files/1/0430/3169/1421/files/achieve_ielts_2_cd.pdf
    • https://cdn.shopify.com/s/files/1/0440/7800/6437/files/scott_s_cheap_flights_reddit.pdf
    • https://cdn.shopify.com/s/files/1/0431/4107/1016/files/60666148456.pdf
    • https://cdn.shopify.com/s/files/1/0436/6876/6873/files/gufibikuguwovofumugujapew.pdf
    • https://cdn.shopify.com/s/files/1/0436/7836/7897/files/fafazokavekolurifo.pdf
    • https://static.usrfiles.com/ugd/b8c837_9c50708b49634e78be66ad99c2191884.pdf
    • https://static.usrfiles.com/ugd/b8c837_d63e9179ec9c4057915a8716084d9ae0.pdf
    • https://static.usrfiles.com/ugd/bae363_a1f6371da5d344ed9182026c0c95d3f8.pdf
    • https://static.usrfiles.com/ugd/1e32c2_8243fca7d83d4358bebdfe9a1af87e83.pdf
    • https://static.usrfiles.com/ugd/c1de29_632a6d2e5e2d4f9aa8b3d55f5b6a5743.pdf
    • https://static.usrfiles.com/ugd/b8c837_eb3b2affd0d54926af29c3c74cd786f5.pdf
    • https://static.usrfiles.com/ugd/19103d_b1b4b814791049d490c1a2edf5cc0c94.pdf
    • https://static.usrfiles.com/ugd/b8c837_a0d3364034134d359eb31f41ffd4f906.pdf
    • https://static.usrfiles.com/ugd/de3d83_2404c58c73dc49d69693de9b2c7cd27a.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006719.bin
17d14c33ac30ebe41b8d725d7545e13bfbdc216260eb8669d748f0c9a45dcd96
pdf-font-stream PDF embedded font (sfnt) at offset 0x6719 5184 bytes
font_01_sfnt_off000078d1.bin
fca78f503952b1a484b627c4dfc2c93c9e24790a5d5bc6ffbe04784b5311dc1f
pdf-font-stream PDF embedded font (sfnt) at offset 0x78D1 10572 bytes