Malicious PDF — malware analysis report

Static analysis result for SHA-256 efaab128c9d6dec1…

MALICIOUS

PDF

56.2 KB Created: 2020-08-31 16:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0afd0815f1f8bcf0ea6f78d80498f1a8 SHA-1: 1c5df2a90aceb8b9b11c6b6348d40b6bf8e1336f SHA-256: efaab128c9d6dec15b0cf6725bd691fbe0b68ed3937ac8d56b23de24836f9393
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=airdroid+apk+free++for+android'. This URL is likely part of a phishing or malware distribution scheme. The document also contains a large number of embedded links, many hosted on Shopify, which is flagged as a PDF SEO link farm. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same malicious URL.

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.cc/wix?keyword=airdroid+apk+free++for+android
    • https://cdn.shopify.com/s/files/1/0432/8977/2190/files/23664845517.pdf
    • https://cdn.shopify.com/s/files/1/0430/7861/5189/files/fewupafaregivuwag.pdf
    • https://cdn.shopify.com/s/files/1/0463/0980/2146/files/20582978282.pdf
    • https://cdn.shopify.com/s/files/1/0434/1045/6726/files/bluetooth_software_for_android_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/7505/1421/files/pezobof.pdf
    • https://cdn.shopify.com/s/files/1/0431/6404/1373/files/97025685392.pdf
    • https://cdn.shopify.com/s/files/1/0430/8379/2548/files/nijapekavipekepexusawakuz.pdf
    • https://cdn.shopify.com/s/files/1/0430/7641/9744/files/67657887310.pdf
    • https://static.usrfiles.com/ugd/3b7182_f0dd9e65a76442e7b83dbe6f1d9a20f8.pdf
    • https://static.usrfiles.com/ugd/a1fb72_35eeb5408f7b4de8ad186d5fcca60018.pdf
    • https://static.usrfiles.com/ugd/9d869b_3468513c7e0a40afb87a90dd498218b1.pdf
    • https://static.usrfiles.com/ugd/b8c837_d68fe38d6d5c49fe9c11b01871f5692c.pdf
    • https://static.usrfiles.com/ugd/b8c837_d0c90cec36e9447080397cc238479b82.pdf
    • https://static.usrfiles.com/ugd/eb4c03_d600256caf1846499563d78b69ea2e32.pdf
    • https://static.usrfiles.com/ugd/aef5b7_d1f2a228e003499bbfcb4f89be67d379.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007e16.bin
d0cbd741b3a1ab6038ccfdd364acb4b4d955b4618f85e689e8a1f026ec1ecc1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E16 3288 bytes
font_01_sfnt_off000089da.bin
185faddbb06b32fcc8bbea5b759c01add759fd2128fd46723860f1d3648d718b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89DA 4880 bytes
font_02_sfnt_off00009a89.bin
24a79662fd5d57423c48f7ca13e3dfd33fb4fe191c3d6dc5898c71f61326033a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A89 10360 bytes
font_03_sfnt_off0000be41.bin
9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE41 16092 bytes

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