Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbcdb306e93e238c…

MALICIOUS

PDF

40.5 KB Created: 2020-07-24 16:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce2874139f2630195a48348e7265a47a SHA-1: 6f546d22d1738e7c903b838c52089c322854e3b2 SHA-256: fbcdb306e93e238cdd8bcb893208aa479ebb987d5db375d56f175e87174d62d8
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily corrupted, suggests a lure related to a children's illustrated Bible, likely to disguise the malicious intent of the link farm.

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.ru/pify?keyword=biblia+catolica+para+ni%25C3%25B1os+ilustrada+pdf
    • http://files.redangelsnetballclub.com/uploads/1/3/0/7/130740496/4442546.pdf
    • http://files.rami-khushaba.com/uploads/1/3/1/4/131452735/rexafolawobeti.pdf
    • http://files.usedlicense.net/uploads/1/3/1/8/131857650/68f440200a34.pdf
    • http://files.swornoathbrand.com/uploads/1/3/0/9/130969809/2405583.pdf
    • https://cdn.shopify.com/s/files/1/0433/2313/0009/files/60300008526.pdf
    • https://cdn.shopify.com/s/files/1/0433/0940/0214/files/1229561991.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8758/files/19225251410.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/8318983330.pdf
    • https://cdn.shopify.com/s/files/1/0429/4492/1766/files/98312557730.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97428896976.pdf
    • https://cdn.shopify.com/s/files/1/0435/9431/7981/files/kegiku.pdf
    • https://cdn.shopify.com/s/files/1/0430/9096/8729/files/35398235252.pdf
    • https://cdn.shopify.com/s/files/1/0428/0510/0707/files/86376204044.pdf
    • https://cdn.shopify.com/s/files/1/0432/5192/5155/files/52713601447.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/file

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005da5.bin
33d74f6a4795d29d8ec98912191911395a22da9b768d6f4a42681c08504f3257
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DA5 5316 bytes
font_01_sfnt_off00006f62.bin
1bb83176f5a533aa5ef2b2d312442867de1c5a9c1fff28b7b3338fac921fd080
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F62 10808 bytes