Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec8aaa4f66343838…

MALICIOUS

PDF

56.9 KB Created: 2020-08-21 17:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 077b0e5bca30e035d19488565dc7b703 SHA-1: 66c5b06a7ba704bcabd5d3d7621736343cda6c4b SHA-256: ec8aaa4f6634383831126766f631046930e28156e0a1bc6296f5772e16fec520
152 Risk Score

Malware Insights

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

The PDF contains embedded links, with one pointing to a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this. Additionally, the 'PDF_SEO_LINK_FARM' heuristic indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results and drive traffic to malicious sites. The ML classifier strongly supports the malicious verdict. No scripts were extracted, but the document body and heuristics clearly indicate a redirection-based attack.

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=chaitrada+chandrama+kannada+videos+song+ing
    • http://files.andonsales.com/uploads/1/3/1/6/131637273/panonegogasovi-kopizonejimux-ribolisez-sazagifiteli.pdf
    • http://nimolo.barefoottofino.com/uploads/1/3/2/7/132741009/8569925.pdf
    • http://files.beewedapp.com/uploads/1/3/1/6/131637302/5813193.pdf
    • http://files.vision73.net/uploads/1/3/1/0/131070674/6ecc3c2b473f9.pdf
    • http://wipelo.thepalominohawaii.com/uploads/1/3/1/3/131380213/vitobuwegumonimuk.pdf
    • https://cdn.shopify.com/s/files/1/0429/5314/6517/files/kisekebevid.pdf
    • https://cdn.shopify.com/s/files/1/0430/6219/8425/files/mababasusibuv.pdf
    • https://cdn.shopify.com/s/files/1/0430/3123/2674/files/17404049339.pdf
    • https://cdn.shopify.com/s/files/1/0431/6895/6565/files/chapter_2_great_gatsby_study_guide_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/6831/6055/files/angular_formarrayname_not_working.pdf
    • https://cdn.shopify.com/s/files/1/0434/7995/7669/files/midewem.pdf
    • https://cdn.shopify.com/s/files/1/0431/7783/6703/files/jon_secada_just_another_day.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/matam.pdf
    • https://cdn.shopify.com/s/files/1/0432/4284/8418/files/49269301974.pdf
    • https://cdn.shopify.com/s/files/1/0437/1116/8663/files/tica_na_administrao_pblica_resumo.pdf
    • https://cdn.shopify.com/s/files/1/0428/0621/4819/files/dictionnaire_synonyme_francais_apk.pdf
    • https://cdn.shopify.com/s/files/1/0452/9104/5026/files/gupujofasag.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000086b8.bin
84b1c0e4fe8f5492ea80ac079ad6eb05715d767f85f9ae775229e7d53bed3f4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86B8 5256 bytes
font_01_sfnt_off0000986c.bin
41a1bf3ed9714ca8ab375e1a304fe91b85eb25ed21f84c0b11b349b2b0b7d103		 pdf-font-stream PDF embedded font (sfnt) at offset 0x986C 14772 bytes
font_02_sfnt_off0000c611.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC611 4324 bytes

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