Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90cd55f34de3143…

MALICIOUS

PDF

43.1 KB Created: 2020-08-23 22:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e87c7f69a72495f31c810fef46817a2d SHA-1: 1d3273c28db0e5e1ddb1cc432998410af1dd89d9 SHA-256: d90cd55f34de3143b60947c9380bb25b36072d0cb25dac7f320e28108ce826b6
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link pointing to 'ttraff.cc', which is flagged as malicious. It also hosts a large number of external PDF links, many of which are hosted on Shopify, suggesting a link farm for SEO manipulation or to obscure the true malicious destination. The ML classifier strongly indicated maliciousness. The document body contains obfuscated text and a URL that appears to be the same as the malicious redirector.

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/pify?keyword=picsart+photo+editor+collage
    • http://files.highpointacademycoralwaycampus.com/uploads/1/3/0/7/130740191/161960.pdf
    • http://files.rosedalecurriculum.com/uploads/1/3/2/6/132695633/luretoxi.pdf
    • http://files.winhornetswin.com/uploads/1/3/1/0/131070604/redowe-kumawamenoxezaj.pdf
    • http://files.fremontpioneerdays.com/uploads/1/3/1/4/131406797/07ce916.pdf
    • https://cdn.shopify.com/s/files/1/0434/4777/9494/files/microelectronic_circuits_and_devices_horenstein.pdf
    • https://cdn.shopify.com/s/files/1/0432/6896/4505/files/pubolirewulodi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5122/9089/files/5905758026.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/hitman_blood_money_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/2756/0610/files/48622715119.pdf
    • https://cdn.shopify.com/s/files/1/0433/6150/1336/files/postal_exam_473.pdf
    • https://cdn.shopify.com/s/files/1/0431/0849/9618/files/xofunalotefumo.pdf
    • https://cdn.shopify.com/s/files/1/0429/5720/9766/files/97523403573.pdf
    • https://cdn.shopify.com/s/files/1/0435/1623/1840/files/flywheel_energy_storage_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/1615/0427/files/merit.pdf
    • https://cdn.shopify.com/s/files/1/0461/1388/2275/files/indesign_templates_poster.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/article_15_movie_subtitles_english.pdf
    • https://cdn.shopify.com/s/files/1/0430/0134/8255/files/26915524585.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_off000066f7.bin
2cf82060a59709e34f4b6973496c80ea199ef83ff00c17b2a67a75c56b23f032		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66F7 5336 bytes
font_01_sfnt_off00007909.bin
2bc1b3354a6ec95e93bb88757ca0e5b93e5e59dff99ff64567b35516990825a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7909 11408 bytes

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