Malicious PDF — malware analysis report

Static analysis result for SHA-256 749c5b094bfe1831…

MALICIOUS

PDF

41.8 KB Created: 2020-08-13 21:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9aa647411d22245e0743286fbbc34a9d SHA-1: c5ae98c44bd74387793e876d229d1c19b75f5849 SHA-256: 749c5b094bfe1831f1206ec696adc69f43e16b979b85b3e3811e403d414d77fe
162 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a movie download, which is a common lure for phishing or malware distribution. The ML classifier strongly indicated maliciousness, and the PDF structure includes a large number of external links, many of which are benign but one points to known malicious infrastructure. No scripts were extracted, but the presence of a malicious URL and the ML detection suggest a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pify?keyword=acrimony+full+movie+free++mp4
    • http://togururab.summitdogrescue.org/uploads/1/3/1/3/131384169/zapuwubur-labumokojipoza.pdf
    • http://files.xinchengqiu.com/uploads/1/3/2/6/132682142/2034277.pdf
    • http://files.artoonsforyou.com/uploads/1/3/2/6/132695919/2098178.pdf
    • http://files.mdt-agilityability.com/uploads/1/3/1/6/131636852/ketimagubi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/2054/0310/files/difference_between_necrosis_and_apoptosis.pdf
    • https://cdn.shopify.com/s/files/1/0437/8276/6750/files/antibioticos_veterinaria.pdf
    • https://cdn.shopify.com/s/files/1/0434/6934/0822/files/suvozogoribizogibararitub.pdf
    • https://cdn.shopify.com/s/files/1/0433/7251/1386/files/69514227547.pdf
    • https://cdn.shopify.com/s/files/1/0432/1637/1867/files/dh_680_immunization_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/9612/1248/files/87260304309.pdf
    • https://cdn.shopify.com/s/files/1/0436/9262/1978/files/t4_bacteriophage.pdf
    • https://cdn.shopify.com/s/files/1/0429/5812/7270/files/68360012990.pdf
    • https://cdn.shopify.com/s/files/1/0432/7096/3350/files/86101640647.pdf
    • https://cdn.shopify.com/s/files/1/0428/0143/0695/files/wiwirugaxumajizepipiwix.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_off000064e3.bin
c010263d22278947e4a440138bb784692f70ecd80c6a5a8c58ad14f9991aaf4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64E3 5012 bytes
font_01_sfnt_off000075ee.bin
a518415fbc7d3298dbdb17f7c56d1a0c4ed739c29c5e21c86060ba667459bab8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75EE 10696 bytes

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