Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c6c3509f47b622f…

MALICIOUS

PDF

41.2 KB Created: 2020-08-22 13:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f39005eb49f23f22634c18afa5053e14 SHA-1: 54b1c8a878da084b5319c9a2c7af13ee8443d2cb SHA-256: 1c6c3509f47b622feeda1a9c858d58370da2094d978a1a453ff7d18bfb27adb7
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one heuristic specifically identifying it as a PDF link farm. The primary redirector URL, 'https://ttraff.cc/pify?keyword=android+studio+add+kotlin+support+to+project', is flagged as malicious. The ML classifier also strongly indicated maliciousness. The document body appears to be largely obfuscated or contains minimal readable content, but the presence of numerous links to external PDFs suggests a traffic-driving or SEO-spamming campaign.

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=android+studio+add+kotlin+support+to+project
    • http://files.bassittdesigns.com/uploads/1/3/2/6/132681488/c043d.pdf
    • http://files.tynycoedsurgery.com/uploads/1/3/0/7/130739996/d3a7f5af9.pdf
    • https://cdn.shopify.com/s/files/1/0434/2520/2332/files/convert_a_publisher_file_to.pdf
    • https://cdn.shopify.com/s/files/1/0430/5358/0439/files/53760901738.pdf
    • https://cdn.shopify.com/s/files/1/0431/5784/8224/files/my_roflcopter_goes_soi_soi_soi.pdf
    • https://cdn.shopify.com/s/files/1/0437/0880/9384/files/improving_boiler_efficiency.pdf
    • https://cdn.shopify.com/s/files/1/0430/8615/1833/files/kizasunamujepipaxif.pdf
    • https://cdn.shopify.com/s/files/1/0429/5219/6249/files/49167838054.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gabagijujusudizal.pdf
    • https://cdn.shopify.com/s/files/1/0430/7081/6407/files/folutawomileza.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8357/files/58128002480.pdf
    • https://cdn.shopify.com/s/files/1/0437/7929/3338/files/69093860578.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_off00006155.bin
9d00eb3d77ff32e7e34cbef5cd1cc9781377dab11fd2c7b481047262a2d6bfed
pdf-font-stream PDF embedded font (sfnt) at offset 0x6155 5196 bytes
font_01_sfnt_off00007311.bin
5a9af195ac47497b0d1f4e32af3776957d85d32958def524314df0431f50f345
pdf-font-stream PDF embedded font (sfnt) at offset 0x7311 10676 bytes