Malicious PDF — malware analysis report

Static analysis result for SHA-256 1244b17436eb3b98…

MALICIOUS

PDF

48.4 KB Created: 2020-08-10 23:41:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7096f0b8e36878feb5a5fe8216095f42 SHA-1: 70655055b485f954daecd36f1588e0e451c537db SHA-256: 1244b17436eb3b9837c81a51fe29833ec7bfca3a7f7ce7fe8bd2e41e7be6a971
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector link, indicating an attempt to drive traffic to malicious or scam-related content. The document body text, though garbled, includes keywords like 'Assam tet notification pdf' and 'wkhtmltopdf', suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing or scam campaign.

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.com/pify?keyword=assam+tet+notification+pdf
    • http://jozabaset.gilpinenterprises.com/uploads/1/3/1/4/131437657/d9a6e1520a95d.pdf
    • http://files.mannykrakowski.com/uploads/1/3/1/4/131453526/pipapetonomaj_wurajog.pdf
    • http://files.bidanigastro.com/uploads/1/3/0/9/130969893/gorufavemuroda.pdf
    • http://files.zcobgyn.org/uploads/1/3/0/7/130776599/ce72a59453.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6768/6558/files/malisafajavovoj.pdf
    • https://cdn.shopify.com/s/files/1/0438/9791/3512/files/brassica_oleracea_var._sabellica.pdf
    • https://cdn.shopify.com/s/files/1/0433/8833/8330/files/ripisuxedubujokuwore.pdf
    • https://cdn.shopify.com/s/files/1/0433/7513/2824/files/rorigize.pdf
    • https://cdn.shopify.com/s/files/1/0430/8090/8951/files/93445379257.pdf
    • https://cdn.shopify.com/s/files/1/0431/4143/1464/files/41437846769.pdf
    • https://cdn.shopify.com/s/files/1/0428/8158/1209/files/wojosawavewekez.pdf
    • https://cdn.shopify.com/s/files/1/0437/5651/9576/files/62815032150.pdf
    • https://cdn.shopify.com/s/files/1/0433/5733/9799/files/78896193273.pdf
    • https://cdn.shopify.com/s/files/1/0433/8135/8753/files/46807044190.pdf
    • https://cdn.shopify.com/s/files/1/0430/4489/6917/files/pinoxefarutapiweravugajef.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_off00007fb0.bin
865d0a431ab6dfaf19e6e061fbfd1ce346d11f791021edbbf246391622eecfb8
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FB0 5160 bytes
font_01_sfnt_off00009125.bin
bcd63e76777c500e658863e14b775294f25ffcdd6f435c0bb47ae0e11103df8e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9125 10396 bytes