Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4769cb4d6073214…

MALICIOUS

PDF

46.8 KB Created: 2020-08-25 00:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd83497f25ca2462665408d8abb02bed SHA-1: b5c2317d23027d86ceda7b4d17482e3ba2897f6e SHA-256: e4769cb4d60732149af29486c31b027a983514de1ce41cf8a80778a90195c02f
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL that is also present in the heuristics. The PDF_SEO_LINK_FARM heuristic indicates the PDF is part of a link farm, likely to improve search engine ranking for malicious content. No scripts were extracted from this sample.

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=microscopic+anatomy+of+skeletal+muscle+answers
    • http://vumid.lshstheatreparents.com/uploads/1/3/1/0/131070197/35296.pdf
    • http://files.gcsemathshub.co.uk/uploads/1/3/0/7/130739697/fetadugijavifa-nasimifupobetol-vusemigetubepa.pdf
    • http://kugivivog.ritecookware.com/uploads/1/3/1/4/131453960/f43badd.pdf
    • http://petuti.mayfieldwoodsorchestra.com/uploads/1/3/1/8/131856072/5882853.pdf
    • http://powufil.flockchiropractic.com/uploads/1/3/0/7/130775455/pupenixadeg_tewunazusaw_rufufudalog_nepadoxepax.pdf
    • https://cdn.shopify.com/s/files/1/0433/6726/8517/files/24856707301.pdf
    • https://cdn.shopify.com/s/files/1/0433/5537/3720/files/36817500768.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/11824045596.pdf
    • https://cdn.shopify.com/s/files/1/0433/8103/1064/files/lusapududij.pdf
    • https://cdn.shopify.com/s/files/1/0433/5186/7557/files/software_test_plan_template.pdf
    • https://cdn.shopify.com/s/files/1/0430/7219/2669/files/kindle_fire_hdx_8._9_user_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/7369/0017/files/fetuvibozana.pdf
    • https://cdn.shopify.com/s/files/1/0429/3525/5203/files/44477073127.pdf
    • https://cdn.shopify.com/s/files/1/0428/9419/6902/files/butatojiwe.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000079dc.bin
063a4a98ce3838efec836052848a0c8a3b5c42e63e7d6920d474fb9d2297d498
pdf-font-stream PDF embedded font (sfnt) at offset 0x79DC 5424 bytes
font_01_sfnt_off00008c4f.bin
503e30145722a886988cd3c12e6c5fe809e41a1332b937ae377b65e327feb4f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C4F 9900 bytes