Malicious PDF — malware analysis report

Static analysis result for SHA-256 54c14ae8b4947677…

MALICIOUS

PDF

38.6 KB Created: 2020-08-18 23:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3ade4a4afea4ebe013090a010d40fe8 SHA-1: 18617556bc8365eab8affc5f381b8f63cea20545 SHA-256: 54c14ae8b49476777b2ed352abc52ecf82c1687f00e1196577fac6bf4e124f7d
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as a worksheet answer key. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK indicates the primary URL leads to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body contains the lure text and the malicious URL, suggesting the intent is to trick the user into clicking the link.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=molarity+problems+worksheet+answers+pdf
    • http://files.thechocolatehousedc.com/uploads/1/3/1/3/131379719/worotopomulem_xutuniditobavud.pdf
    • https://cdn.shopify.com/s/files/1/0435/3844/8548/files/chamonix_piste_map.pdf
    • https://cdn.shopify.com/s/files/1/0437/1765/6728/files/genegukoxozijula.pdf
    • https://cdn.shopify.com/s/files/1/0432/3203/4980/files/saxovawozasexefisikowobes.pdf
    • https://cdn.shopify.com/s/files/1/0431/2806/2109/files/37297216740.pdf
    • https://cdn.shopify.com/s/files/1/0438/3545/7696/files/centrelink_carers_allowance_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/5407/9910/files/audio_tape_information.pdf
    • https://cdn.shopify.com/s/files/1/0431/3939/9842/files/muvibegazep.pdf
    • https://cdn.shopify.com/s/files/1/0428/1673/3340/files/31125292626.pdf
    • https://cdn.shopify.com/s/files/1/0440/8256/1176/files/abrsm_selected_piano_exam_pieces_grade_1.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_off0000580f.bin
c6e0cd6e50a4f6581bcfeb8776ca6720379bb93652275ead6aa2d1f58bb82515		 pdf-font-stream PDF embedded font (sfnt) at offset 0x580F 5684 bytes
font_01_sfnt_off00006b57.bin
656bc98385be3232413f110c149ad7519aa2e355c38e6705dc77dd1fb3f4768a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B57 10180 bytes

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