Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b9bcb0da15c30d…

MALICIOUS

PDF

40.4 KB Created: 2020-08-01 08:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf2bd2f6cd6d14b8f01d2e5a68295c25 SHA-1: 7a00b093dc5594e2984ffc3788f1ad06d43dd2cd SHA-256: f5b9bcb0da15c30d59eec4a5789ce033ec0010d50af4f74b0717ed39cbf39034
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one heuristic specifically identifying it as a 'PDF SEO Link Farm'. The primary malicious URL identified is 'https://ttraff.com/pify?keyword=javascript+replace+all', which is flagged as a malicious redirector. The document body contains obfuscated JavaScript, suggesting an attempt to disguise malicious activity.

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=javascript+replace+all
    • http://files.saenz-lab.com/uploads/1/3/1/4/131482853/5018688.pdf
    • http://files.stonetouch-knoop.com/uploads/1/3/1/4/131454116/vubifabeja.pdf
    • http://files.steependurance.com/uploads/1/3/2/6/132683000/pudidipumenu-ketolekigote-puxuwirupimulur-nekajabapa.pdf
    • http://files.marykuhlmannantholz.com/uploads/1/3/0/9/130969904/pavudozizogiluwaluju.pdf
    • https://cdn.shopify.com/s/files/1/0434/3264/0664/files/tapumunesaxezakejib.pdf
    • https://cdn.shopify.com/s/files/1/0434/0436/1884/files/jedibeza.pdf
    • https://cdn.shopify.com/s/files/1/0433/1284/0872/files/bemonari.pdf
    • https://cdn.shopify.com/s/files/1/0429/1778/9862/files/sositizorefopolig.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81667611697.pdf
    • https://cdn.shopify.com/s/files/1/0432/4327/4402/files/how_to_use_futurerestore.pdf
    • https://cdn.shopify.com/s/files/1/0433/3430/3912/files/14926507384.pdf
    • https://cdn.shopify.com/s/files/1/0431/2249/1541/files/mining_leveling_guide_osrs.pdf
    • https://cdn.shopify.com/s/files/1/0429/5006/6339/files/pexawebanubulamuduburir.pdf
    • https://cdn.shopify.com/s/files/1/0437/1313/4757/files/tumotikaxadomozujivusifo.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_off000060f6.bin
96182c4d4e9f344db5bf5d1930258431923c38ec38a652d4aab21647eaf3550a
pdf-font-stream PDF embedded font (sfnt) at offset 0x60F6 4976 bytes
font_01_sfnt_off000071f8.bin
12c63a12d3b251cda666b5956db9c87355d6fd281a96c287611e8cbe289706bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x71F8 10300 bytes