Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a7f1a6c596a7d6…

MALICIOUS

PDF

43.9 KB Created: 2020-08-15 06:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dca6b420185949869953f51409634f50 SHA-1: 2910163808a0be6cbfb52b3024c9639d724690fd SHA-256: f5a7f1a6c596a7d6e8ce7373d55a33526c77caeae306fa7d33d384cb1d68595a
152 Risk Score

Malware Insights

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

The PDF contains a clear lure for 'Kindle books free pdf' and embeds a link to a redirector at 'ttraff.com'. This redirector is known to lead to malicious content. The PDF also contains a large number of links to other PDFs hosted on Shopify, likely for SEO manipulation to improve the visibility of the malicious redirector. The ML classifier strongly flagged this PDF as malicious.

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/wb?keyword=kindle%20books%20free%20pdf
    • http://files.galexystudio.com/uploads/1/3/0/7/130775109/0546b.pdf
    • http://files.vinvero.com/uploads/1/3/0/9/130969310/5172346.pdf
    • http://files.belennalauto.com/uploads/1/3/1/0/131070674/lajof_ninojavowatuvi_fokipuzonimewe.pdf
    • http://files.leslieopatril.ca/uploads/1/3/0/7/130775249/gipokejem_fajol_pumunusoripow_xidexatuxas.pdf
    • https://cdn.shopify.com/s/files/1/0431/4012/0733/files/basizoxovolatowasurolab.pdf
    • https://cdn.shopify.com/s/files/1/0431/0820/4701/files/27287496828.pdf
    • https://cdn.shopify.com/s/files/1/0435/8098/1403/files/above_top_secret_book.pdf
    • https://cdn.shopify.com/s/files/1/0440/9117/9160/files/vavitivikitog.pdf
    • https://cdn.shopify.com/s/files/1/0430/1769/9477/files/davijuvuvowin.pdf
    • https://cdn.shopify.com/s/files/1/0429/0481/3721/files/17932259581.pdf
    • https://cdn.shopify.com/s/files/1/0427/4041/6678/files/pit_bull_american_pit_bull_terrier.pdf
    • https://cdn.shopify.com/s/files/1/0445/9141/5460/files/lopressor_davis_drug_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/6473/7438/files/gravely_compact_pro_34.pdf
    • https://cdn.shopify.com/s/files/1/0437/4138/0762/files/agastya_samhita_in_kannada.pdf
    • https://cdn.shopify.com/s/files/1/0435/5801/1035/files/mercedes_glb_2020_preisliste.pdf
    • https://cdn.shopify.com/s/files/1/0433/7578/8188/files/introductory_chemistry_lab_manual_corwin.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_off000062f5.bin
8c4f93dc7c317ad089f34e3a10220545f3a3b83934d62bf972cf235f03c4c817		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62F5 4704 bytes
font_01_sfnt_off000072da.bin
962279c32b926b4d10c7829478edd261e165741a6e1ef67d557ebd4d9843c09c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72DA 9868 bytes
font_02_sfnt_off00009491.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9491 4324 bytes

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