Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b0f5b72c3508c8…

MALICIOUS

PDF

49.1 KB Created: 2020-08-14 06:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eadd1e43ec4ce4611e77965d81d8db6f SHA-1: 91285549243a5dfc4586f43fb661a55d9df7d87f SHA-256: a1b0f5b72c3508c81dd59b3b8c8a749249b25d53e1713b49890f1e37c9860431
154 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector. The document body text, though partially obfuscated, includes the URL 'https://ttraff.cc/pify?keyword=difficulties+in+reading+academic+research+reports', which is also flagged as a malicious redirector. This suggests the document's primary purpose is to redirect users to malicious content via this link.

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=difficulties+in+reading+academic+research+reports
    • http://files.perryyoungblood.com/uploads/1/3/0/7/130740092/c408ac.pdf
    • http://files.driesenga.com/uploads/1/3/0/7/130776822/sofovejubutuz.pdf
    • http://files.cockrillms.com/uploads/1/3/2/6/132695392/2817214.pdf
    • http://nowate.area59district47aa.org/uploads/1/3/0/7/130739169/sekut.pdf
    • http://bilag.josephinepearls.com/uploads/1/3/0/7/130775350/datumidulamowawepa.pdf
    • https://cdn.shopify.com/s/files/1/0429/5580/0732/files/77869280257.pdf
    • https://cdn.shopify.com/s/files/1/0429/6579/4965/files/character_development_chart.pdf
    • https://cdn.shopify.com/s/files/1/0433/6926/7354/files/tufexiwekexutab.pdf
    • https://cdn.shopify.com/s/files/1/0440/7921/8840/files/arm_cortex_m4_programming.pdf
    • https://cdn.shopify.com/s/files/1/0427/8072/1311/files/vuvitoxedajafakanifezali.pdf
    • https://cdn.shopify.com/s/files/1/0434/3191/9765/files/ruseroxolubalejaboxazomig.pdf
    • https://cdn.shopify.com/s/files/1/0428/0595/2671/files/5622662358.pdf
    • https://cdn.shopify.com/s/files/1/0433/8787/9580/files/pokefusijujuxev.pdf
    • https://cdn.shopify.com/s/files/1/0430/7222/5442/files/sejarah_kota_lama_semarang.pdf
    • https://cdn.shopify.com/s/files/1/0431/3264/9636/files/analogies_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/5664/4774/files/50463787110.pdf
    • https://cdn.shopify.com/s/files/1/0429/2693/2124/files/physical_science_grade_11_tg.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_off00007f38.bin
695458a5a779e0bf591bbe94728e53f71a2ee3d411b1830012fdd71b67db04ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F38 5568 bytes
font_01_sfnt_off000091f6.bin
0080311a546794b4e9d052bdf3dafd8d5c87b6df046b2259cd0ff162deadeeb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91F6 10908 bytes

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