Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a16543b2ae574c7…

MALICIOUS

PDF

57.2 KB Created: 2020-08-13 05:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fdd2151867a6b50b1e4fc7fc79768cc5 SHA-1: 9c6bc6b65dd38500c375ac812b205b402a93926c SHA-256: 2a16543b2ae574c7f646739601f61a8163666e5442003d882400a18200eedec6
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify, likely for SEO manipulation. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to lure users to a harmful site.

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/wb?keyword=lordosis%20adalah%20pdf
    • http://dawir.alexandrasearle.com/uploads/1/3/0/7/130774993/1bac6a6f4.pdf
    • http://kepaf.simplybest.org.uk/uploads/1/3/1/4/131438610/12ad8d0ca34401a.pdf
    • http://files.sebmakeup.com/uploads/1/3/2/6/132695361/sefejibogete.pdf
    • https://cdn.shopify.com/s/files/1/0437/2702/8375/files/artificial_neural_networks_and_machine_learning_icann_2020.pdf
    • https://cdn.shopify.com/s/files/1/0440/6879/8614/files/nuzalifag.pdf
    • https://cdn.shopify.com/s/files/1/0428/9154/2681/files/xigiguruvedelebogupura.pdf
    • https://cdn.shopify.com/s/files/1/0433/4583/8234/files/47334161133.pdf
    • https://cdn.shopify.com/s/files/1/0432/3534/4539/files/15418044731.pdf
    • https://cdn.shopify.com/s/files/1/0431/0840/1306/files/analisi_periodo_esercizi.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8317/files/87671763055.pdf
    • https://cdn.shopify.com/s/files/1/0428/9688/3868/files/nusidotav.pdf
    • https://cdn.shopify.com/s/files/1/0431/7354/4093/files/89897431576.pdf
    • https://cdn.shopify.com/s/files/1/0430/3051/1779/files/fotamuw.pdf
    • https://cdn.shopify.com/s/files/1/0447/8536/9239/files/alter_ego_plus_a2.pdf
    • https://cdn.shopify.com/s/files/1/0436/0231/3373/files/rudapukawuwosinuwogirov.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/lulejufawe.pdf
    • https://cdn.shopify.com/s/files/1/0429/8981/3909/files/56851921540.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_off000095cf.bin
debfcb2df7521ab4128a0eea6f4afb74e64582200715269e91bcf9038c427694		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95CF 4552 bytes
font_01_sfnt_off0000a548.bin
5e3592140c1a3afbb164104374434cb166c70f01fcd4fd0ac3b32413cbaec23f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA548 10620 bytes
font_02_sfnt_off0000c958.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC958 4324 bytes

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