Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f914677e29ca782…

MALICIOUS

PDF

32.9 KB Created: 2020-08-19 05:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aaeec070d07afebead11d819dcfdfdcd SHA-1: f99eb00520e1f0cb69ed1e008e71a63e1aa40718 SHA-256: 5f914677e29ca7828645063ad04e93eed8a7d928bd52f2f6a70b543417e28f41
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a high number of embedded links, many pointing to redirector infrastructure, indicating an attempt to lead users to malicious sites. The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector link further supports this. The document body, though partially corrupted, contains the URL that triggers the redirector.

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=tiger+blood+in+mouth+movie
    • http://zotov.thesummittgroupllc.com/uploads/1/3/1/4/131408899/kigupe_mojamijoka.pdf
    • http://files.healthyandfitwny.com/uploads/1/3/1/3/131380687/1328a29.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5504/6037/files/89426098791.pdf
    • https://cdn.shopify.com/s/files/1/0432/6873/5140/files/xojesutabexebobegumuravo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7678/8117/files/free_maya_models.pdf
    • https://cdn.shopify.com/s/files/1/0434/3939/0872/files/.pdf
    • https://cdn.shopify.com/s/files/1/0433/8191/5802/files/chapter_3_maths_class_10.pdf
    • https://cdn.shopify.com/s/files/1/0431/6083/0116/files/57928345502.pdf
    • https://cdn.shopify.com/s/files/1/0438/0209/9873/files/lp_bronkopneumonia_pada_anak_terbaru.pdf
    • https://cdn.shopify.com/s/files/1/0432/8125/2512/files/xewuzogexot.pdf
    • https://cdn.shopify.com/s/files/1/0434/0128/1703/files/don_t_worry_be_happy_video_song.pdf
    • https://cdn.shopify.com/s/files/1/0435/8940/2779/files/91572473742.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_off00004474.bin
df408ad15ea3c76744c60253d8e606a442fd4380011dc8158c36ca066627e5dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x4474 5000 bytes
font_01_sfnt_off00005548.bin
21b1c3b5fbecbf3d91cb89efc6f00cc20331b678fea6e89edb2977901d945144
pdf-font-stream PDF embedded font (sfnt) at offset 0x5548 9980 bytes