Malicious PDF — malware analysis report

Static analysis result for SHA-256 096a129ccfc80736…

MALICIOUS

PDF

39.9 KB Created: 2020-08-14 03:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ef99ccccf9e606acccbf2b9d74a0253 SHA-1: 6f52dabcb16f3c1028a362c59f2c88be800f64cd SHA-256: 096a129ccfc80736af96f935bd1c496f9983961e26a169d18716fd4c6d82e971
162 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service. The document body, though heavily obfuscated, contains a URL that leads to a known malicious redirector. This suggests a phishing or scam attempt, likely using the 'ESL worksheet for grade 1' lure to entice clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=esl+worksheet+for+grade+1
    • http://files.wordsmithphoto.com/uploads/1/3/1/4/131483371/2d7377cf2f2f80c.pdf
    • http://files.toralconsulting.com/uploads/1/3/0/7/130775732/6a26d23286b0c6.pdf
    • http://files.avsyum.com/uploads/1/3/2/3/132302876/bebaj-vutetulawuxugip-bitobazur.pdf
    • http://files.robertthorntononline.com/uploads/1/3/2/8/132815054/d4c2813e8aa84.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/5770/9210/files/approval_form_1b.pdf
    • https://cdn.shopify.com/s/files/1/0432/1522/4996/files/94560372737.pdf
    • https://cdn.shopify.com/s/files/1/0433/0523/8692/files/lumemosejovoxa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6836/6760/files/zoxikowufigarowixaxa.pdf
    • https://cdn.shopify.com/s/files/1/0431/7347/8560/files/vemon.pdf
    • https://cdn.shopify.com/s/files/1/0437/7378/8321/files/cuentos_cortos_en_ingles_con_imagenes.pdf
    • https://cdn.shopify.com/s/files/1/0431/2878/3002/files/70505268915.pdf
    • https://cdn.shopify.com/s/files/1/0434/2225/3205/files/lil_louis_french_kiss.pdf
    • https://cdn.shopify.com/s/files/1/0437/6294/2106/files/98980610988.pdf
    • https://cdn.shopify.com/s/files/1/0433/9728/3992/files/carcharhinus_longimanus.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/appareil_digestif.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/viborovikumowenaben.pdf
    • https://cdn.shopify.com/s/files/1/0434/4394/5622/files/act_reading_practice_test_with_answers.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005dec.bin
281a14c18b6dd15bce0a0e6898901775310ef4207774b58815fdecc3c253b809		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DEC 5332 bytes
font_01_sfnt_off00007025.bin
5a84ff8b7e07e33f19a95ae812f3c1b2d9b4b87549d321d11fc5480d55f0465b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7025 10224 bytes

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