Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a209b1b00b0be4…

MALICIOUS

PDF

48.2 KB Created: 2020-07-31 02:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1735ec5d75073937fd152d6e3f500a17 SHA-1: 964287516230ad7e0585bc1d139bda8c03cf144f SHA-256: a4a209b1b00b0be48ac48d21e5226c28f61fb2bede842cd0e04093aa62b59bc1
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. The primary heuristic firing indicates that the PDF links to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure for biographical information, likely to disguise the malicious intent of the embedded links.

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/pify?keyword=biografi+auguste+comte+pdf
    • http://files.michaudwellness.com/uploads/1/3/2/6/132681617/saxunol.pdf
    • http://files.sapphiremj.com/uploads/1/3/0/7/130776413/8835389.pdf
    • http://files.michaelsawczynec.com/uploads/1/3/1/0/131071063/falexaduwumurifuxo.pdf
    • https://cdn.shopify.com/s/files/1/0433/5498/0507/files/mizizesuziginibiwapebu.pdf
    • https://cdn.shopify.com/s/files/1/0435/0866/2440/files/kedenejasuwegorovog.pdf
    • https://cdn.shopify.com/s/files/1/0433/0677/8784/files/45939828082.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fasexerogetotano.pdf
    • https://cdn.shopify.com/s/files/1/0431/5702/9019/files/kadawalume.pdf
    • https://cdn.shopify.com/s/files/1/0431/5719/2853/files/93235530486.pdf
    • https://cdn.shopify.com/s/files/1/0430/4008/0025/files/32592804820.pdf
    • https://cdn.shopify.com/s/files/1/0434/0531/2154/files/ponibenifowizimero.pdf
    • https://cdn.shopify.com/s/files/1/0428/6598/3655/files/xutibireribivujakubin.pdf
    • https://cdn.shopify.com/s/files/1/0432/4176/7072/files/dosebezobeperezixekevu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/53035505239.pdf
    • https://cdn.shopify.com/s/files/1/0429/6992/3740/files/tefinimosuselilenin.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/
    • https://cdn.shopify.com/s/files/1/0431/5702/9019/f

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007fa9.bin
1e09c918b016df05b81cd26a419445b787df29bf26c178a17a4ddc8de8396999
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FA9 5268 bytes
font_01_sfnt_off00009196.bin
c5e7eb428757326549916839b0cb232fba1406443cc717b8b7a5a317896bbe21
pdf-font-stream PDF embedded font (sfnt) at offset 0x9196 9980 bytes