Malicious PDF — malware analysis report

Static analysis result for SHA-256 f582d3d0d98338d3…

MALICIOUS

PDF

44.0 KB Created: 2020-08-26 00:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8d7aa0d2d1bde7397530359a0d4cd82 SHA-1: 080ba67e9454bd28c26931b837b44a30c588b25e SHA-256: f582d3d0d98338d380855ebba883c67d04882467148481fac8fe0452e1f57461
154 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary malicious redirector URL identified. The document body, though partially corrupted, includes the malicious URL and several benign-looking URLs, likely to create a facade of legitimacy. The ML classifier strongly indicated maliciousness, supporting the presence of a malicious redirector.

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/pify?keyword=passive+voice+present+progressive+exercises+pdf
    • http://files.nwtfloatplane.com/uploads/1/3/1/0/131070723/b14800.pdf
    • http://files.guntweaks.com/uploads/1/3/0/8/130874612/7453548.pdf
    • http://fiwawo.jayhawkgreatpyrenees.com/uploads/1/3/1/4/131438437/5048992.pdf
    • http://getol.catherinedanielfitness.com/uploads/1/3/0/8/130874388/gexivumodarafagufap.pdf
    • https://cdn.shopify.com/s/files/1/0431/8458/6903/files/oxford_phonics_spelling_dictionary_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/4248/0021/files/biblia_septuaginta_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0449/5484/5352/files/scented_dryer_sheets_kill_bed_bugs.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7325/files/2e_chronomancer.pdf
    • https://cdn.shopify.com/s/files/1/0430/9693/2505/files/42679540016.pdf
    • https://cdn.shopify.com/s/files/1/0435/2281/8200/files/lunir.pdf
    • https://cdn.shopify.com/s/files/1/0437/1179/1257/files/badlapur_full_movie_bolly4u.pdf
    • https://cdn.shopify.com/s/files/1/0436/0926/0190/files/reading_cvc_words.pdf
    • https://cdn.shopify.com/s/files/1/0462/8722/4993/files/call_recorder_app_for_android_9.pdf
    • https://cdn.shopify.com/s/files/1/0437/8450/3453/files/loi_binomiale_exercice_corrig.pdf
    • https://cdn.shopify.com/s/files/1/0435/3599/0936/files/widubebaxusutuk.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_off00006116.bin
fdbac4b222e24218ac4e7c94b26d68185973f671d7078cf9a6735a0b27414786		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6116 5208 bytes
font_01_sfnt_off000072e1.bin
40e4c6f72f82be08bb30c80a7ab3094e3aa629ec9449c54e8bcbb515a75ac558		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72E1 9956 bytes
font_02_sfnt_off000094f7.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94F7 4324 bytes

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