Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee843d7fb0cf0be1…

MALICIOUS

PDF

47.2 KB Created: 2020-08-02 20:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16d47a1084446f9c3178d285a7356534 SHA-1: 88805ea0ead9e1a7c8b115428a1f3bcaa40ce60d SHA-256: ee843d7fb0cf0be1c63029c5c683c9ee68b3b03f79b1ba835eff7deb9a3475b7
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to obscure the final destination of the malicious payload. The document body and embedded links suggest a social engineering lure related to social media manipulation. The ML classifier strongly indicated maliciousness, and the presence of a link farm further supports a malicious intent to drive traffic to potentially harmful sites.

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=delete+twitter+likes
    • http://files.bettycarlsonartist.com/uploads/1/3/1/4/131453015/2848707.pdf
    • http://files.arielakader.com/uploads/1/3/0/7/130775537/13fb77ba88cd7.pdf
    • http://files.sophiebrenneman.com/uploads/1/3/2/6/132695492/zatoxur.pdf
    • http://files.peterantor.com/uploads/1/3/2/7/132740598/gigedo-xonas-debigulifafefil-kebofaji.pdf
    • http://files.hannahsroorart.com/uploads/1/3/1/8/131871956/kikusogun.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/73582334633.pdf
    • https://cdn.shopify.com/s/files/1/0434/7936/7846/files/37135158819.pdf
    • https://cdn.shopify.com/s/files/1/0429/3056/9382/files/14474781480.pdf
    • https://cdn.shopify.com/s/files/1/0439/5037/5070/files/wugix.pdf
    • https://cdn.shopify.com/s/files/1/0433/7133/1742/files/30586666464.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3760/files/53666269745.pdf
    • https://cdn.shopify.com/s/files/1/0435/8701/0728/files/how_to_terminate_program_in_java.pdf
    • https://cdn.shopify.com/s/files/1/0431/5090/1402/files/kusimefirelixemo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6586/files/jemovifonu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7089/7824/files/88678833998.pdf
    • https://cdn.shopify.com/s/files/1/0432/1335/7214/files/loxixixi.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_off00007e4f.bin
b665d7100c5eb8850f06dc2f4322e76c7620be35829b0bb062f7063b399d58ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E4F 4624 bytes
font_01_sfnt_off00008e31.bin
9e46a5a5b01ff32959f0e13cba61612fb93f03ef8eb7e79ea16bcd3293c7f35a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E31 9996 bytes