Malicious PDF — malware analysis report

Static analysis result for SHA-256 6329f237cb03e767…

MALICIOUS

PDF

48.1 KB Created: 2020-07-28 22:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e64044cff6d6a0052ee16354797fad8 SHA-1: 5bcafe28bd549559dc7e0f290d796120f9b70bc6 SHA-256: 6329f237cb03e7670f084472b546e2ae6211e109fd51888a6d4ad2c2cf90da88
154 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 are designed to appear as educational worksheets but ultimately lead to a redirector service. This indicates a phishing or scam attempt, likely using the document as a lure to drive traffic to malicious sites. The ML classifier strongly supports the malicious nature of this PDF.

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=cvc+words+worksheets+for+grade+3
    • http://files.campevergreendaycamp.com/uploads/1/3/1/4/131453214/2627312.pdf
    • http://files.restorationisnow.com/uploads/1/3/1/0/131070526/5509096.pdf
    • http://files.wombwelltownfc.net/uploads/1/3/0/7/130740624/dd7e0f.pdf
    • http://files.camphillhudson.org/uploads/1/3/0/8/130813364/raxunat.pdf
    • http://files.questbusinesses.com/uploads/1/3/2/6/132683330/464694.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8980/5983/files/ropuvowaxa.pdf
    • https://cdn.shopify.com/s/files/1/0432/4635/4594/files/3356224866.pdf
    • https://cdn.shopify.com/s/files/1/0429/9456/5271/files/vudewiregipiborewajezow.pdf
    • https://cdn.shopify.com/s/files/1/0432/4586/3067/files/3426493366.pdf
    • https://cdn.shopify.com/s/files/1/0434/1530/6405/files/87653056220.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/59880702755.pdf
    • https://cdn.shopify.com/s/files/1/0429/6284/5859/files/kuvevepepolagenu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4796/8149/files/8997874662.pdf
    • https://cdn.shopify.com/s/files/1/0432/6152/6166/files/suvow.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75555741983.pdf
    • https://cdn.shopify.com/s/files/1/0437/7654/0824/files/31424639942.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/1366931903.pdf
    • https://cdn.shopify.com/s/files/1/0438/5862/4672/files/tewozoko.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d54.bin
629123bfde0685c5f69bbdd27ec008bde0224d5c30af1dabb990f6ee33ea778e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D54 6440 bytes
font_01_sfnt_off00007d48.bin
4e3055772904c83080a9e504969a4a06f574af8d278bd4e5ce1879da66d2bdcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D48 5288 bytes
font_02_sfnt_off00008f6d.bin
7a3c3de8d8f3dce20a3430a1361d8004bc7c06e8cdc093394a81172a7c229788		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F6D 10328 bytes

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