Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9a2ee91bee53f4e…

MALICIOUS

PDF

48.0 KB Created: 2020-08-21 20:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d481831bb9568b479c46fd863dd1ee0b SHA-1: b0fb34e556714087abbf5101c69717b89a927f0a SHA-256: e9a2ee91bee53f4e2fb8797f0a783e363dc032886a38b6cd8bd64b2c1b46e727
152 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous embedded URLs, many pointing to benign Shopify domains, but one critical link redirects to a known malicious domain (ttraff.com). The document body, though heavily obfuscated, contains the text 'Avery labels sizes 2 per sheet' and the malicious redirector URL, suggesting a lure to a potentially malicious site. The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector link confirms a malicious intent to lead the user to a harmful destination.

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=avery+labels+sizes+2+per+sheet
    • http://files.barriointellect.com/uploads/1/3/2/7/132740321/104c7d.pdf
    • http://files.dittmarfarms.com/uploads/1/3/0/7/130775892/gitigawas.pdf
    • http://kejazik.janelleenvy.com/uploads/1/3/2/6/132696212/38ee62f4.pdf
    • http://sudisinuv.commonwheel.org.uk/uploads/1/3/1/3/131380213/74bccb647e31e.pdf
    • https://cdn.shopify.com/s/files/1/0438/9843/7784/files/bucksaw_resort_fishing_report.pdf
    • https://cdn.shopify.com/s/files/1/0428/6336/2204/files/84369177340.pdf
    • https://cdn.shopify.com/s/files/1/0431/7780/3931/files/talajazijiresibimok.pdf
    • https://cdn.shopify.com/s/files/1/0432/5824/9380/files/43092325046.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/65069223210.pdf
    • https://cdn.shopify.com/s/files/1/0440/8947/5237/files/pawipuxijezije.pdf
    • https://cdn.shopify.com/s/files/1/0432/8862/5316/files/mizaxovotidogenigut.pdf
    • https://cdn.shopify.com/s/files/1/0428/9173/9295/files/airway_management_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/8924/5861/files/southpaw_full_movie_hd_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/8784/6806/files/opposite_of_always_free.pdf
    • https://cdn.shopify.com/s/files/1/0427/8861/8396/files/akuntansi_pajak_atas_piutang.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_off000071f9.bin
e8a4b32965f17727942cba51bd89b33a43b5b4e174f2c4f5f6d973b2e99ab165
pdf-font-stream PDF embedded font (sfnt) at offset 0x71F9 5380 bytes
font_01_sfnt_off0000844d.bin
24802f033888fb03e7c1ad616d1b0710717e31e4f6f1d3b3d27fb6019cce6ffc
pdf-font-stream PDF embedded font (sfnt) at offset 0x844D 14228 bytes