Malicious PDF — malware analysis report

Static analysis result for SHA-256 0506bb0b84796636…

MALICIOUS

PDF

50.2 KB Created: 2020-08-14 10:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca529fb42b15ded893325ef03f466c8c SHA-1: dc0158ddcab29cfcb2c7ed75c6bef3abb4290179 SHA-256: 0506bb0b84796636d0a2288d3542aa15a78dc127562cb227ba7d9525b213b7bf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, with a critical heuristic identifying one as a malicious redirector. The document body, though partially corrupted, includes text related to 'comparing decimals practice worksheet' and the malicious URL, suggesting a lure. The presence of a large number of external PDF links, many pointing to Shopify, indicates a potential link farm or SEO manipulation tactic to distribute malicious content.

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/wb?keyword=comparing%20decimals%20practice%20worksheet
    • http://files.rabbisussman.com/uploads/1/3/1/3/131383613/zovifazem.pdf
    • http://posera.mintzathletics.com/uploads/1/3/1/1/131164250/fulavewubowemul.pdf
    • http://wezewubo.mschontel.com/uploads/1/3/1/4/131438079/16d47b7.pdf
    • http://files.freshairfitness.net/uploads/1/3/0/7/130738892/padominonu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/0399/2474/files/62246539144.pdf
    • https://cdn.shopify.com/s/files/1/0431/1921/4758/files/72740022624.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6429/files/converter_bmp_to_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/4462/5822/files/sobotodopapesapekewuduxu.pdf
    • https://cdn.shopify.com/s/files/1/0436/5913/3081/files/pusijaresusajofuxetipibir.pdf
    • https://cdn.shopify.com/s/files/1/0440/9065/4885/files/tinkle_digest_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/8273/5006/files/rurudoboxoneguvi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0989/1742/files/46005805007.pdf
    • https://cdn.shopify.com/s/files/1/0431/8180/1629/files/bootstrap_3_w3schools.pdf
    • https://cdn.shopify.com/s/files/1/0435/7508/3169/files/kelvinator_commercial_refrigerator_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/5332/5219/files/fresno_police_scanner.pdf
    • https://cdn.shopify.com/s/files/1/0430/6350/9143/files/tolilopaxofini.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_off000076e6.bin
36e1b1257fbdc205e6390fe1b3b4a0e0488ce1c57a3b1e6e1b4e7573be78c185		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76E6 5548 bytes
font_01_sfnt_off000089a3.bin
07e754a962602bbd1cb58e74650c31e2061e2eb786cdba762edfeba5ae700ac5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89A3 15236 bytes

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