Malicious PDF — malware analysis report

Static analysis result for SHA-256 78887baacb981efe…

MALICIOUS

PDF

45.6 KB Created: 2020-08-13 22:39:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21a4328d22ca1177ecd11149fb5e860d SHA-1: d51b89dce83d64785119a4194462fe7813cc1425 SHA-256: 78887baacb981efec4f07f1afe8f56c2857fbafe46350ec832c38d9f0f1459d8
154 Risk Score

Malware Insights

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

The PDF document contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body text, though heavily obfuscated, contains the lure 'Annamayya video songs hd' and the malicious URL. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, suggesting a link farm or SEO poisoning attempt. The ML_NYX_PDF_MALICIOUS classifier strongly supports the malicious nature of this PDF.

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=annamayya+video+songs++hd
    • http://nuluwikat.lewisburgbankruptcy.com/uploads/1/3/0/9/130969744/3981706.pdf
    • http://files.btccricket.co.uk/uploads/1/3/2/6/132682868/nudor.pdf
    • http://rujov.shakespeareaz.com/uploads/1/3/1/4/131453133/jupinor.pdf
    • https://cdn.shopify.com/s/files/1/0431/4349/5841/files/jabug.pdf
    • https://cdn.shopify.com/s/files/1/0434/7668/0869/files/41720352625.pdf
    • https://cdn.shopify.com/s/files/1/0430/0043/0746/files/71937499929.pdf
    • https://cdn.shopify.com/s/files/1/0431/8973/1479/files/biology_notes_for_class_12_ncert.pdf
    • https://cdn.shopify.com/s/files/1/0430/0151/2095/files/mirebelamefosopukiraluj.pdf
    • https://cdn.shopify.com/s/files/1/0434/5459/5225/files/sowosix.pdf
    • https://cdn.shopify.com/s/files/1/0451/7930/6135/files/kindred_jungling_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/8585/6919/files/18332505098.pdf
    • https://cdn.shopify.com/s/files/1/0432/3134/6856/files/xefexavotibegewemej.pdf
    • https://cdn.shopify.com/s/files/1/0441/2178/4472/files/apa_publication_manual_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/4933/7507/files/92680035960.pdf
    • https://cdn.shopify.com/s/files/1/0436/7699/1653/files/5037148025.pdf
    • https://cdn.shopify.com/s/files/1/0432/5320/3102/files/bifubik.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/
    • https://cdn.shopify.com/s/files/1/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006690.bin
353bfdc2e0c571341955787340ddcb13656bffabaad0f8f7e86bac5b618d3c46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6690 5264 bytes
font_01_sfnt_off00007855.bin
18b3c7326af5ea493ae0fba78954496a6b4d3f5356133707341a9519daa12bb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7855 3908 bytes
font_02_sfnt_off000086fd.bin
a5b94a3da9e98ad80d807f333b0022622039efb3db08ef2cae23e6dc4075c13a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86FD 9896 bytes

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