Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4d9855d7ba55e4…

MALICIOUS

PDF

37.0 KB Created: 2020-08-20 13:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec1797f86fe298207222ab990e0a0fcf SHA-1: dc7b03e0b3c0909e1a0aa8de829b5acdc3b9f859 SHA-256: 5b4d9855d7ba55e4c3844cfb55416f75f2f30fca8cb700a34e6ff2eb9d88b8e9
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service. The document body, though heavily obfuscated, contains text related to product listings and a URL that appears to be a redirector. The presence of numerous external links and a malicious redirector suggests an attempt to lead the user to malicious content or phishing pages.

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.ru/pify?keyword=king+size+platform+bed+with+storage+underneath
    • http://files.panaraimports.com/uploads/1/3/0/7/130776503/mowewijuw-biwetididetawup-tawerirajin-tegelokedop.pdf
    • http://gepuxu.globaleducationmove.com/uploads/1/3/1/4/131438500/dodopamusumawovu.pdf
    • http://files.hitrahestesenter.com/uploads/1/3/0/7/130740142/3be43d95a5b145c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/molukutozaruxavupemifin.pdf
    • https://cdn.shopify.com/s/files/1/0432/8249/7696/files/tanuvu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/25668779603.pdf
    • https://cdn.shopify.com/s/files/1/0428/7417/5644/files/calendar_2020_december.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rokagarunawawutasa.pdf
    • https://cdn.shopify.com/s/files/1/0434/0118/3384/files/biotic_and_abiotic_examples.pdf
    • https://cdn.shopify.com/s/files/1/0436/4432/1945/files/advantages_and_disadvantages_of_twisted_pair_cable.pdf
    • https://cdn.shopify.com/s/files/1/0432/2246/6727/files/kuror.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_off00005357.bin
3f0002e5b76d4c28b756c850499c521a3cd286edd87499b582925dc5052ca352
pdf-font-stream PDF embedded font (sfnt) at offset 0x5357 5704 bytes
font_01_sfnt_off000066ad.bin
ef75a81782de14e770fc944f4a55d93fbb3549a3500f987fd1d72c09a3365090
pdf-font-stream PDF embedded font (sfnt) at offset 0x66AD 9608 bytes