Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a09daca25e73914…

MALICIOUS

PDF

46.4 KB Created: 2020-08-20 01:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2dbcbe7ff56e5bcf082899b2f253a802 SHA-1: dcaee18211af95168dac2782f6bb884c8ab97077 SHA-256: 3a09daca25e739140b6399ec124ed2cfa07c2239efb4fb69485a4fd6fe720c4b
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the text 'Late homework pass template' and the malicious URL, suggesting a social engineering lure. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves redirecting the user to a malicious site via the embedded 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.com/pify?keyword=late+homework+pass+template
    • http://files.cybelesings.com/uploads/1/3/2/7/132710632/mavupilafex.pdf
    • http://files.thecostumepartyshop.com.au/uploads/1/3/1/3/131380181/sekalil.pdf
    • http://files.rweirworks.com/uploads/1/3/1/6/131637108/47ddf8c9a7057.pdf
    • https://cdn.shopify.com/s/files/1/0429/8221/1735/files/fibuzutasukuzana.pdf
    • https://cdn.shopify.com/s/files/1/0431/7062/7735/files/big_data_analytics_gtu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/81579197248.pdf
    • https://cdn.shopify.com/s/files/1/0433/4954/1013/files/wonajuzimij.pdf
    • https://cdn.shopify.com/s/files/1/0431/2216/3876/files/powopasotekemitifel.pdf
    • https://cdn.shopify.com/s/files/1/0428/4973/0727/files/57049365071.pdf
    • https://cdn.shopify.com/s/files/1/0430/6921/0773/files/timopofewul.pdf
    • https://cdn.shopify.com/s/files/1/0438/3290/1789/files/product_business_proposal_letter_sample.pdf
    • https://cdn.shopify.com/s/files/1/0429/3902/3526/files/another_day_of_sun_piano_notes.pdf
    • https://cdn.shopify.com/s/files/1/0431/9969/2958/files/tamepadas.pdf
    • https://cdn.shopify.com/s/files/1/0427/9471/3244/files/history_of_agricultural_extension_in_nigeria.pdf
    • https://cdn.shopify.com/s/files/1/0432/3213/3278/files/jovozat.pdf
    • https://cdn.shopify.com/s/files/1/0433/4629/6985/files/30639693176.pdf
    • https://cdn.shopify.com/s/files/1/0440/6778/2821/files/73477813573.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_off00007996.bin
e8547c89bee2596d081d157fbfe7ea92ceea281b2c3c0abda0fe63fec5cd28a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7996 5156 bytes
font_01_sfnt_off00008b0e.bin
61e770364215fab89be461974b27a95a1adb36c3401edecabdf00c576055b797		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B0E 9880 bytes

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