Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7664b8e2984cd0e…

MALICIOUS

PDF

41.9 KB Created: 2020-08-19 12:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20ccb02064a7f50f5f9b61fa2556dc94 SHA-1: e9a6fd3893e63bae04e1e812c091b1657d33f569 SHA-256: a7664b8e2984cd0efe39f334c61c0e24da95309a0749181496b035ceac5355d3
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors, indicating a phishing or malicious redirection attempt. The ML classifier strongly flagged this PDF as malicious. The presence of a malicious redirector link further supports 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=new+bhakti+dj+song++2019
    • http://files.pattonvilledb8.com/uploads/1/3/0/7/130775143/7264206.pdf
    • http://files.mrmichaelfinney.org/uploads/1/3/1/3/131380870/2ef36f2e5193c.pdf
    • http://files.summithilltopperfootball.com/uploads/1/3/1/8/131856435/3067c.pdf
    • http://files.ostendmarineservices.com/uploads/1/3/1/8/131871786/pasigozunobujez.pdf
    • http://files.newjerseytaxilimo.com/uploads/1/3/2/6/132682281/3196096.pdf
    • https://cdn.shopify.com/s/files/1/0437/7837/5829/files/15470816762.pdf
    • https://cdn.shopify.com/s/files/1/0440/8170/9206/files/26124049390.pdf
    • https://cdn.shopify.com/s/files/1/0436/0008/5160/files/22637779643.pdf
    • https://cdn.shopify.com/s/files/1/0438/3090/2946/files/bhagavad_gita_slokas_in_malayalam.pdf
    • https://cdn.shopify.com/s/files/1/0431/1390/6327/files/45646117236.pdf
    • https://cdn.shopify.com/s/files/1/0440/3301/5958/files/risk_management_techniques_in_insurance.pdf
    • https://cdn.shopify.com/s/files/1/0440/1030/7749/files/animate_cc_software_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kefemomorevogik.pdf
    • https://cdn.shopify.com/s/files/1/0434/5279/2982/files/90235763288.pdf
    • https://cdn.shopify.com/s/files/1/0431/1361/1413/files/muwumovem.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000465f.bin
059f805712d57e103e6ac969c9603beac2cab24e6561e9d7a6134aa4a15fc95d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x465F 5568 bytes
font_01_sfnt_off00005959.bin
b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5959 3720 bytes
font_02_sfnt_off000064bc.bin
f1f0c51069865773ddbe5fc0546d5a4fb9b27523e6d57a3aa41c9f652adb8882		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64BC 12220 bytes
font_03_sfnt_off00008c44.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C44 4324 bytes

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