Malicious PDF — malware analysis report

Static analysis result for SHA-256 13552bb7db0257a6…

MALICIOUS

PDF

42.7 KB Created: 2020-08-06 18:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e6ce147dc181528f760d9859913e6cf SHA-1: e4d7e6a85a6d72e5e74651edeeb78e320bbebc7d SHA-256: 13552bb7db0257a6c22a3772161afe8623c4b003ccb062df75e576f0012782a3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to what appears to be a link farm designed for SEO manipulation. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=aashto+tp+70+pdf+free+download'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains similar URLs, reinforcing the malicious intent.

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=aashto+tp+70+pdf+free+download
    • http://files.shopstudiofitrx.com/uploads/1/3/0/8/130874332/af69ede329e6fb.pdf
    • http://files.wynnstan.com/uploads/1/3/0/8/130814411/saputudosevo-lirow-lisejolu-ronedipuziwow.pdf
    • http://files.centersquaremotors.com/uploads/1/3/1/4/131406202/72cd482be9f359.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/0768/0405/files/59168370112.pdf
    • https://cdn.shopify.com/s/files/1/0435/2219/5608/files/dimisanipojulukar.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jenodilibaxu.pdf
    • https://cdn.shopify.com/s/files/1/0427/6404/2396/files/dapiwukukaraka.pdf
    • https://cdn.shopify.com/s/files/1/0433/7932/7141/files/pdf_to_wmf.pdf
    • https://cdn.shopify.com/s/files/1/0435/7586/9599/files/something_corporate_konstantine.pdf
    • https://cdn.shopify.com/s/files/1/0448/1361/5264/files/capitalismo_socialismo_y_democracia_schumpeter.pdf
    • https://cdn.shopify.com/s/files/1/0427/9622/0572/files/amparito_roca_aubrey_winter.pdf
    • https://cdn.shopify.com/s/files/1/0434/9011/5748/files/cuestionario_ser_bachiller_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/8026/1525/files/xolelu.pdf
    • https://cdn.shopify.com/s/files/1/0446/9538/8313/files/jquery._ajax_headers.pdf
    • https://cdn.shopify.com/s/files/1/0430/5184/3737/files/rodegomezog.pdf
    • https://cdn.shopify.com/s/files/1/0433/2588/2518/files/titanfall_2_monarch_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/8088/4129/files/62323718197.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050f8.bin
c1d86ba4264f51ade624a61b6158f399f8a562921fcf708307415a941b306ea9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50F8 5172 bytes
font_01_sfnt_off00006294.bin
3dff774280fc1c044d755fc17b2e7387568507615ee58fb81b7116869138b341		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6294 2512 bytes
font_02_sfnt_off00006d8f.bin
f357b5454be3c038a9783e83c2e15e9e5b2278a98612390362d07afe4bfeb312		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D8F 9876 bytes
font_03_sfnt_off00008f60.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F60 4324 bytes

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