Malicious PDF — malware analysis report

Static analysis result for SHA-256 87efae98b5002130…

MALICIOUS

PDF

44.2 KB Created: 2020-09-17 07:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71ebaaeebcee605190aefa9b04ced2f2 SHA-1: ac71f0a6d844d28a351b4d46a450802522c8cd38 SHA-256: 87efae98b5002130cdb641a6416fb9a3e289e4ae64c7c90624d46850a81155ef
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including a redirector to a malicious domain, and is flagged as a link farm. The document body, though heavily obfuscated, contains text related to 'distance between parallel lines worksheet pdf' and a URL that appears to be part of a SEO spam campaign. The presence of embedded URLs and the link farm heuristic suggest an attempt to drive traffic to malicious or spam content, potentially as a lure for phishing or malware distribution.

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.link/wix?keyword=distance+between+parallel+lines+worksheet+pdf
    • http://xaziduvi.jaguar50mmafitness.com/uploads/1/3/0/8/130814017/sipedokemo_bikusuz.pdf
    • http://moxud.uswib.com/uploads/1/3/1/3/131398504/d94bb6d1b.pdf
    • http://files.solarplexusbeauty.com/uploads/1/3/1/4/131452741/4180307.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/2650/5128/files/pekuxakefeso.pdf
    • https://cdn.shopify.com/s/files/1/0438/1612/4576/files/graphics_design_manual.pdf
    • https://cdn.shopify.com/s/files/1/0462/2771/8293/files/champakamala_song_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/7127/4146/files/2128926939.pdf
    • https://cdn.shopify.com/s/files/1/0439/1531/3307/files/atlanta_airport_map.pdf
    • https://cdn.shopify.com/s/files/1/0465/8426/6919/files/the_beatles_full_album_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/6409/8970/files/novemezunawo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8549/6482/files/lebedoninebipexejemilexe.pdf
    • https://cdn.shopify.com/s/files/1/0461/6912/9123/files/chudiyan_song_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0429/3846/6471/files/rofunibawerox.pdf
    • https://a23ace06-9a6b-4fc7-baa3-6208dd7aa267.filesusr.com/ugd/2ac701_f7622f845f2242de8cb19c1d8eccca30.pdf?index=true
    • https://acfb9882-7693-4208-aedd-11c3c1f77416.filesusr.com/ugd/31593d_2455c8edaed44d66be683d8c04b3c55a.pdf?index=true
    • https://869217da-dcc2-43da-a6b8-30e3b04a8d2f.filesusr.com/ugd/e54fc7_4387a3e909bd4e0daba4a6b05e90ac9c.pdf?index=true
    • https://da4bd84a-b6f6-420b-b04c-8be7bf30fedd.filesusr.com/ugd/26f730_758edcec079e438fa2eeb2173512f4d2.pdf?index=true
    • https://edee2c22-466b-4b6d-9c2c-039f9a52fb2c.filesusr.com/ugd/defcb2_74be114442ac4d48ad21596ffe630fda.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000056ee.bin
385f800f853e7814e217fdef3f8a12f11efc53881603a5f0081df3359480472a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56EE 5328 bytes
font_01_sfnt_off00006900.bin
2280d4e980d57446f5b58c52ccae2c8c18d8d48ddc74366d877416520b16922b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6900 14140 bytes
font_02_sfnt_off0000957a.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x957A 4324 bytes

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