Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d57a1bb608fd3f8…

MALICIOUS

PDF

43.6 KB Created: 2020-08-25 04:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d97df5d5b20960b13bc07b2ab4fda4a3 SHA-1: 76b7e0a6a8aea6a69339004979d24087b71e626d SHA-256: 9d57a1bb608fd3f880058eb0e061c78f31f9b4f7c1f2f73de36f0eac0fcd903e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, 'https://ttraff.cc/pify?keyword=geotechnical+report+example', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated but contains references to the malicious URL and benign-looking PDF filenames, suggesting a lure to disguise the malicious intent.

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=geotechnical+report+example
    • http://gomis.matheascatering.com/uploads/1/3/1/0/131070719/vosomabo-midalexogav-jalekimexe-vupup.pdf
    • http://files.halovolleyball.com/uploads/1/3/0/7/130740442/964015a1404.pdf
    • http://files.waggawaggaprobus.waggamatters.com/uploads/1/3/1/3/131380771/pisobiretipew_gujeluzaf_bedapuraker_rojefawosodo.pdf
    • http://files.louiskugelman.com/uploads/1/3/0/7/130739593/voxurunuzerujiv-kixorunifaz-zagala-vibebi.pdf
    • http://files.msmtax.com/uploads/1/3/1/4/131406390/sutig.pdf
    • https://cdn.shopify.com/s/files/1/0431/6043/6900/files/xinuvuletuwomu.pdf
    • https://cdn.shopify.com/s/files/1/0437/3122/2677/files/php_extract_number_from_url.pdf
    • https://cdn.shopify.com/s/files/1/0435/7337/9231/files/lavazimesem.pdf
    • https://cdn.shopify.com/s/files/1/0431/0453/4692/files/63108105092.pdf
    • https://cdn.shopify.com/s/files/1/0428/0333/1231/files/new_arbitration_act_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/bivodawar.pdf
    • https://cdn.shopify.com/s/files/1/0439/0620/3803/files/functional_foods_and_nutraceuticals.pdf
    • https://cdn.shopify.com/s/files/1/0430/1740/4573/files/korudadibokon.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78683638278.pdf
    • https://cdn.shopify.com/s/files/1/0440/5726/4280/files/pezafow.pdf
    • https://cdn.shopify.com/s/files/1/0435/6728/4383/files/84051666636.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_off00006dc9.bin
9470862b2c1177e4cbb28c61ea6f7603bfc2a9e7e90282e05ab15f7f7e7420f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DC9 5096 bytes
font_01_sfnt_off00007eef.bin
9cdd1cab09257364f487faf4ffca83e6b47bb802a35989db1dce7d67d5b56b69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EEF 10152 bytes

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