Malicious PDF — malware analysis report

Static analysis result for SHA-256 d835b91244b867cd…

MALICIOUS

PDF

40.7 KB Created: 2020-08-05 11:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8c0368c89fd6c571e0d0e57c0520d92 SHA-1: ebe2951b0c41013e564e2f4cf96fa5afbcddb55c SHA-256: d835b91244b867cdcdcad4f8e11e7a608ebc54cb8ae8ddce1944b5bd3ab56d81
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a known malicious redirector. The document body, though malformed, contains text related to 'Abu Dhabi international airport map pdf' and includes the malicious redirector URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly supports the malicious verdict.

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.ru/pify?keyword=abu+dhabi+international+airport+map+pdf
    • http://files.thewriterhobbyist.com/uploads/1/3/1/4/131453221/denidevuwalirano.pdf
    • http://files.southcoastathletics.com/uploads/1/3/1/4/131407857/b7bf54361228.pdf
    • http://files.hikingautism.com/uploads/1/3/2/7/132740536/478575f5bd17.pdf
    • http://files.abraxasband.net/uploads/1/3/1/4/131437380/maderaf_figedivukujedad_wuzujojimabo.pdf
    • http://files.kjlhealthproducts.net/uploads/1/3/2/6/132682989/a637ff16.pdf
    • https://cdn.shopify.com/s/files/1/0428/6650/7942/files/legikajufu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/42632515291.pdf
    • https://cdn.shopify.com/s/files/1/0431/4021/9037/files/37362416869.pdf
    • https://cdn.shopify.com/s/files/1/0440/4147/0117/files/sinozidifalefesezo.pdf
    • https://cdn.shopify.com/s/files/1/0433/2231/0811/files/benojabixemebaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/6635/8934/files/35396825313.pdf
    • https://cdn.shopify.com/s/files/1/0435/0610/6528/files/jubibidozidovux.pdf
    • https://cdn.shopify.com/s/files/1/0433/6680/9765/files/21467803815.pdf
    • https://cdn.shopify.com/s/files/1/0437/6389/2376/files/zogavevumixetedum.pdf
    • https://cdn.shopify.com/s/files/1/0434/1350/4156/files/kekevatefobiwudoxonu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6500/7509/files/70732056196.pdf
    • https://cdn.shopify.com/s/files/1/0432/1991/0811/files/29984175256.pdf
    • https://cdn.shopify.com/s/files/1/0432/6758/8252/files/ravigofepami.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_off000062f0.bin
75a60fe694a5708683ed668390614f6e4752ff984e2f7cec567b04d84b6c7eca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62F0 5232 bytes
font_01_sfnt_off0000748e.bin
e3377ef0aae682c63583c1aaa8237d46b5a30f996afda7163f36024fdc46550a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x748E 9648 bytes

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