Malicious PDF — malware analysis report

Static analysis result for SHA-256 549f54ba6c56e863…

MALICIOUS

PDF

47.4 KB Created: 2020-08-14 01:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31f8bb6ddfdaa211e74e876eb9da6691 SHA-1: 4b9d934d8b422eb600d476554f716a445ec5bc7a SHA-256: 549f54ba6c56e863c5dcb5d5afda23850aba6184c9244d41bce89944144b8e1e
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 'https://ttraff.cc/pify?keyword=boishakhi+mela+song'. Additionally, it features a PDF link farm heuristic, with the first URL being 'https://cdn.shopify.com/s/files/1/0436/1751/7731/files/cells_and_their_organelles.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though partially corrupted, contains the same redirector URL, suggesting an attempt to lure users to a malicious 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.cc/pify?keyword=boishakhi+mela+song
    • http://files.josezayaspr.com/uploads/1/3/0/7/130739951/lexerejibube.pdf
    • http://files.knightshalloffame.com/uploads/1/3/1/6/131606289/jugujapepubidipo.pdf
    • http://files.hellewoodworks.com/uploads/1/3/0/7/130776275/9e8bbbfcd6a2f68.pdf
    • https://cdn.shopify.com/s/files/1/0436/1751/7731/files/cells_and_their_organelles.pdf
    • https://cdn.shopify.com/s/files/1/0428/4992/7327/files/after_livro_5_baixar.pdf
    • https://cdn.shopify.com/s/files/1/0433/9158/2357/files/21453772936.pdf
    • https://cdn.shopify.com/s/files/1/0432/6873/5140/files/australian_groundwater_modelling_guidelines_barnett_2012.pdf
    • https://cdn.shopify.com/s/files/1/0429/1543/0559/files/8ball_mjg_living_legends.pdf
    • https://cdn.shopify.com/s/files/1/0440/1594/3845/files/50563538381.pdf
    • https://cdn.shopify.com/s/files/1/0438/0209/9873/files/liteletujivuvi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1855/0430/files/intermediate_biology_olympiad_questions.pdf
    • https://cdn.shopify.com/s/files/1/0429/0281/4876/files/customary_law_cases.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/96328102714.pdf
    • https://cdn.shopify.com/s/files/1/0435/2029/5064/files/nabelinix.pdf
    • https://cdn.shopify.com/s/files/1/0431/7049/6661/files/nanowakoxobizawemigi.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_off00006b74.bin
b71878f4e7e344a8449df02b444347daf3de1cccf9ed36a9ec92184cca1ec92a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B74 5116 bytes
font_01_sfnt_off00007cb9.bin
3bbe5958edbf95c3fdd599af14dfc97388d05553e26667e00d453f1192b9e2b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CB9 5136 bytes
font_02_sfnt_off00008d21.bin
42b5075292cc27895b67a2fd6ddc46d4d7e32a4824732fd4fa71b0577eabad7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D21 9908 bytes

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