Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc063b3b00e1fd73…

MALICIOUS

PDF

53.4 KB Created: 2020-08-03 07:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d549b7f05615089928cf2238f7822de0 SHA-1: b8ef30e3d3bd94dc2b3208d611c2ef55cce22d64 SHA-256: dc063b3b00e1fd730a3d3ac0a15746335d7dd70bd68255df732b0b0cf1965307
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, indicating an attempt to lead the user to a harmful site. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' directly supports this. Additionally, the 'PDF_SEO_LINK_FARM' heuristic suggests a large number of outbound links, many hosted on Shopify, which is a common tactic for SEO poisoning or distributing malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.cc/wb?keyword=rainer%20maria%20rilke%20der%20panther%20pdf
    • http://files.afforablehomesociety.com/uploads/1/3/1/3/131379382/fukanudimejaw-luvusavopem-josobojokegav.pdf
    • http://files.oonumasansougroup.com/uploads/1/3/0/7/130738748/1853983.pdf
    • http://dagokov.nvf-vt.net/uploads/1/3/1/6/131606636/vonelekal_lajam.pdf
    • https://cdn.shopify.com/s/files/1/0433/9249/9877/files/51870370760.pdf
    • https://cdn.shopify.com/s/files/1/0431/5434/2042/files/excel_inventory_template.pdf
    • https://cdn.shopify.com/s/files/1/0432/8266/1526/files/93678697052.pdf
    • https://cdn.shopify.com/s/files/1/0430/8575/8617/files/56618129292.pdf
    • https://cdn.shopify.com/s/files/1/0432/6539/2804/files/xolafabumusirosoku.pdf
    • https://cdn.shopify.com/s/files/1/0431/4444/6118/files/30529748516.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/4107173541.pdf
    • https://cdn.shopify.com/s/files/1/0437/3495/8229/files/zowijogatelazirim.pdf
    • https://cdn.shopify.com/s/files/1/0434/0531/2154/files/15756464052.pdf
    • https://cdn.shopify.com/s/files/1/0429/3158/5180/files/sowezemefavor.pdf
    • https://cdn.shopify.com/s/files/1/0429/6648/3103/files/kamenakuzak.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_off00008857.bin
5e020e0a54143217402bbe40734d747ec3103ef9d34238f3d2aff578b8c911f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x8857 5172 bytes
font_01_sfnt_off000099c8.bin
ac7510a7f431d78903a4b1771c4896f75e3f6dffd112f2bbb099b1d4c7061388
pdf-font-stream PDF embedded font (sfnt) at offset 0x99C8 14772 bytes