Malicious PDF — malware analysis report

Static analysis result for SHA-256 80328b2b80de8ee2…

MALICIOUS

PDF

42.9 KB Created: 2020-07-28 13:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7f56c5c9c9db1c95a8c310a9be9dd13 SHA-1: 1851252ee9717f69d03eace34b93af7dbde8d65b SHA-256: 80328b2b80de8ee29716f6c58203ebcb06ddf6be157d55b1d512d73f317ce0d7
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, with a critical heuristic firing for a PDF link farm. One of these links, https://ttraff.ru/pify?keyword=questionario+anamnestico+pdf, points to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be related to a questionnaire, likely a lure to encourage clicks on the malicious links. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=questionario+anamnestico+pdf
    • http://files.partocica.com/uploads/1/3/1/3/131380466/pagakunufitoxulasat.pdf
    • http://files.revivalfamily.ca/uploads/1/3/1/6/131636890/rokin.pdf
    • http://files.amycvena.com/uploads/1/3/1/3/131380951/xowojeno_fakumelof_xafexixumagil_degosemo.pdf
    • http://files.beauchampfarmsva.com/uploads/1/3/1/3/131383434/lejuxugimegajikifivo.pdf
    • http://files.amycvena
    • https://cdn.shopify.com/s/files/1/0430/4420/8797/files/faloberudonurukarusajo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3673/7699/files/13557131811.pdf
    • https://cdn.shopify.com/s/files/1/0437/5881/3342/files/xoxokulur.pdf
    • https://cdn.shopify.com/s/files/1/0437/7644/2519/files/95210842673.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fedixudarat.pdf
    • https://cdn.shopify.com/s/files/1/0431/8799/4792/files/57096221966.pdf
    • https://cdn.shopify.com/s/files/1/0434/0239/5813/files/87240617279.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9805/files/13097178839.pdf
    • https://cdn.shopify.com/s/files/1/0439/2216/1832/files/lagidoxinawigisofifu.pdf
    • https://cdn.shopify.com/s/files/1/0428/4992/7327/files/9270179617.pdf
    • https://cdn.shopify.com/s/files/1/0429/2201/6934/files/17290227638.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/55628578329.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fofigez.pdf
    • https://cdn.shopify.com/s/files/1/0435/4460/8920/files/88185602582.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_off00006902.bin
7bf0c9d6810296cacdeeab2c1e743dec34edb027a3c52713c66891b8caa10a9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6902 5212 bytes
font_01_sfnt_off00007a98.bin
b3d34ed7866ec912b042ebf51be3639f9da13515024cddf1c9aba3f22a0be38a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A98 10508 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.