Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8487bbf978fa282…

MALICIOUS

PDF

50.3 KB Created: 2020-08-03 12:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0eb09073f5d994f609d21fae8d754ef8 SHA-1: 4c97181c824fe974306c8c7525b830282512470e SHA-256: c8487bbf978fa282ad586cf21e59a021eac960b97e95c6eb63cb9ad71481cb98
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.com, which is designed to lure users to malicious content. The document body, though heavily obfuscated, contains the same URL and a search query suggesting a lure. The PDF also hosts a large number of links to other PDFs, many hosted on cdn.shopify.com, which is indicative of a link farm used for SEO poisoning or to obscure the true malicious destination.

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=decode+base64+to+pdf+android
    • http://files.aislingmcgloughlin.com/uploads/1/3/0/7/130738741/jufakuka-kamus-jidawanub.pdf
    • http://files.tn932.org/uploads/1/3/0/7/130775292/dugaku.pdf
    • http://files.topcheesesteaks.com/uploads/1/3/0/8/130813885/jawupep-dobopafogajene.pdf
    • http://files.adrpalbany.com/uploads/1/3/0/8/130873877/274811.pdf
    • https://cdn.shopify.com/s/files/1/0428/7427/3948/files/85420790709.pdf
    • https://cdn.shopify.com/s/files/1/0433/4852/5206/files/dunaridu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/66691602327.pdf
    • https://cdn.shopify.com/s/files/1/0436/1040/7069/files/wipejavorukak.pdf
    • https://cdn.shopify.com/s/files/1/0431/7233/1675/files/dufitirekupomexipixav.pdf
    • https://cdn.shopify.com/s/files/1/0433/7870/4549/files/senenezexukejakapope.pdf
    • https://cdn.shopify.com/s/files/1/0437/5658/5121/files/88549666881.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7576/files/vavifobijikesodotaforof.pdf
    • https://cdn.shopify.com/s/files/1/0428/3262/5831/files/cyberlink_media_suite_essentials.pdf
    • https://cdn.shopify.com/s/files/1/0429/8060/6111/files/33499255806.pdf
    • https://cdn.shopify.com/s/files/1/0429/9338/5633/files/66671651436.pdf
    • https://cdn.shopify.com/s/files/1/0429/0222/5059/files/56300314451.pdf
    • https://cdn.shopify.com/s/files/1/0432/2135/2606/files/97873805844.pdf
    • https://cdn.shopify.com/s/files/1/0429/3555/0119/files/mass_effect_2_assignments.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_off00007875.bin
2f51e3d7d5153bca613969237fae54eeeb531d74467680620c2c48a32afa74b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7875 5500 bytes
font_01_sfnt_off00008b3c.bin
ec7e9a53900db23cd39834f6dd4b0524a278163ef8cdde65cf138a032d511918		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B3C 15996 bytes

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