Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bd39bccddafacfa…

MALICIOUS

PDF

40.6 KB Created: 2020-08-21 00:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23b83a24cc10db7644bdcd767dde0539 SHA-1: f20fb4bad4874fa829b3f46bfab495562653b32b SHA-256: 8bd39bccddafacfa5ec137669fdf8b672f87c8853ed7cdc5d7ec329f159f536c
154 Risk Score

Malware Insights

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

The PDF contains a prominent link disguised as a search result for 'Google play store apk for kindle fire', which redirects to a malicious URL. This indicates a social engineering attempt to trick the user into downloading a potentially malicious application. The PDF also contains a large number of links to other PDFs hosted on Shopify, likely part of a link farm to improve search engine ranking for malicious lures.

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=google+play+store+apk+for+kindle+fire
    • http://files.medicalsemiology.com/uploads/1/3/1/3/131379034/0024f849f.pdf
    • https://cdn.shopify.com/s/files/1/0438/7025/7320/files/kevidube.pdf
    • https://cdn.shopify.com/s/files/1/0432/5274/4347/files/ejercicios_caida_libre_y_lanzamiento_vertical_4_eso.pdf
    • https://cdn.shopify.com/s/files/1/0430/9811/2167/files/24112617728.pdf
    • https://cdn.shopify.com/s/files/1/0437/3312/3221/files/pegason.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/3294478915.pdf
    • https://cdn.shopify.com/s/files/1/0432/5244/9435/files/sogasetemolelibitefo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xasojikunu.pdf
    • https://cdn.shopify.com/s/files/1/0429/3279/7603/files/fekosufoguwini.pdf
    • https://cdn.shopify.com/s/files/1/0436/5395/5742/files/7364210851.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_off0000608d.bin
5ae4d31f426a5439ce0e890b77d6c197afb14a1de403c83ce2d4a0be5e6b2f77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x608D 5408 bytes
font_01_sfnt_off00007311.bin
10bfe707c75ed3d1635a34162610c73381b13846a3aa372e7abc8f03c5746b95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7311 10292 bytes

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