Malicious PDF — malware analysis report

Static analysis result for SHA-256 31db579f93b22f8c…

MALICIOUS

PDF

41.2 KB Created: 2020-08-10 12:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6c06bbd618636f8c43e8be3f7a3e7a4 SHA-1: 1406202da5106ef2d662dd10a396ae70157b7f0f SHA-256: 31db579f93b22f8c65916cb3cf35e59913a6ae4ebdb6182903f8384692aede19
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to a known malicious redirector at 'https://ttraff.com/pify?keyword=analytical+research+methodology+pdf'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect the user to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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=analytical+research+methodology+pdf
    • http://vuzorozo.rickstoneschurch.com/uploads/1/3/2/8/132814930/gapijegena_sileja.pdf
    • http://files.andrerowejr.com/uploads/1/3/1/4/131483266/ca4e507432.pdf
    • http://files.croissantandcovenice.com/uploads/1/3/0/8/130814636/af3249a712e0.pdf
    • http://files.endofnovelty.com/uploads/1/3/1/6/131636987/c396de7cd6.pdf
    • https://cdn.shopify.com/s/files/1/0434/0498/4483/files/bodabigapixuligigo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96672573922.pdf
    • https://cdn.shopify.com/s/files/1/0434/4011/1782/files/wibokadijalurebibo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7157/8024/files/91371864296.pdf
    • https://cdn.shopify.com/s/files/1/0428/4783/0183/files/zogalipinofoves.pdf
    • https://cdn.shopify.com/s/files/1/0435/1187/3695/files/biwuxitasavowewatoto.pdf
    • https://cdn.shopify.com/s/files/1/0428/3577/1558/files/kasosisexokezotu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0519/0041/files/antenna_and_wave_propagation_by_u._a._bakshi_a._v._bakshi_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/5239/9777/files/taking_cara_babies_abcs_of_sleep_download.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_off00006192.bin
bbb793e6ae97dd749e380ecb2128d71cc20424106dfb3bd28f8cf407358148eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x6192 5660 bytes
font_01_sfnt_off000074b0.bin
3a99d7d21677b854cc2e7b24fc84f42ca181ede0c4ff9adade28395ee87be482
pdf-font-stream PDF embedded font (sfnt) at offset 0x74B0 10452 bytes