Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aefcbf57ae08965…

MALICIOUS

PDF

53.8 KB Created: 2020-09-09 07:39:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba5ebd842ccd8e74e0d683153d4774da SHA-1: 16ce48cedfb4c39f9bcabaab78bf07e4a9ab3af4 SHA-256: 5aefcbf57ae08965cbab7a13452211e48551431fed717cefe052a7026065e24b
154 Risk Score

Malware Insights

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

This PDF document contains a high number of embedded links, many of which point to benign Shopify URLs, but one critical link directs to a known malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to lure users to potentially harmful content under the guise of performance upgrades.

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.link/wix?keyword=2016+brute+force+750+performance+upgrades
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8738/9087/files/oslomet_bibliotek_og_informasjonsvitenskap.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51439980706.pdf
    • https://cdn.shopify.com/s/files/1/0463/0819/6517/files/94878759865.pdf
    • https://cdn.shopify.com/s/files/1/0433/7244/5846/files/baixar_cd_alexandre_pires_antigas_su.pdf
    • https://cdn.shopify.com/s/files/1/0440/6683/2534/files/nuxabesoviwup.pdf
    • https://static.usrfiles.com/ugd/b8c837_12a2c83f2b20499789281d00ed5d31f4.pdf
    • https://static.usrfiles.com/ugd/238140_54e97328d4ee48969d197bacb2911885.pdf
    • https://static.usrfiles.com/ugd/93c935_878eedbabe7b45649deaed32e0a0f1ab.pdf
    • https://static.usrfiles.com/ugd/36f25b_119a762a02784304adf522c06aae05ea.pdf
    • https://static.usrfiles.com/ugd/5b604d_e6f7a17bc28342718ee478e626a1563e.pdf
    • https://static.usrfiles.com/ugd/8de238_169f27d0d2354e4593772ce19b97a228.pdf
    • https://static.usrfiles.com/ugd/aaaf79_82e67bb14b4d4682acb91fe4cf560449.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_off00008e54.bin
2194cb71d64458b783d93453c25823342bae30e720efc204265d97318f345845
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E54 6172 bytes
font_01_sfnt_off0000a346.bin
8356e28186c48265ce9ec717383e6cb266d62a4b822858d52369d75342b4c502
pdf-font-stream PDF embedded font (sfnt) at offset 0xA346 10968 bytes